BMW E38 Powertrain

Please note that we do not cover all existing technical details, as we aim to provide a simple, easy to read, yet efficient insight on the available E38 powertrain alternatives along with their community-established pros and cons, in order for the potential buyers to know what they're getting into when deciding to buy such beautiful machines.

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Diesel

1. The E38 725tds

Engine Overview and Specs

The engine that powered the BMW E38 725tds was a 2.5-liter inline-six (I6) turbodiesel, identified as the M51D25. This engine was a single overhead camshaft (SOHC) design with 12 valves, featuring indirect fuel injection, which was common in diesel engines of that era. It was paired with a turbocharger to increase power output while maintaining impressive fuel economy, making it quite good for long-distance cruising while also offering considerably lower running costs than its gasoline counterparts.  

Performance

The M51 engine in the 725tds only delivered 143 horsepower (105 kW) at 4,400 rpm and 260 Nm of torque (191 lb-ft) at 2,200 rpm. While this power output may not seem particularly high by modern standards or compared to the more capable engines in the E38 range, the 725tds compensated with its generous torque, especially at lower rpm. This made it particularly good for relaxed, effortless cruising, especially at highway speeds, and provided adequate acceleration for everyday driving. 

• Power Output: 143 hp (105 kW) at 4,400 rpm
• Torque: 260 Nm (191 lb-ft) at 2,200 rpm
• 0-100 km/h (0-62 mph) Acceleration: 12 seconds
• Top Speed: 205 km/h (127 mph)

The engine's power delivery was smooth and linear, typical of inline-six diesels, and it provided just enough low-end torque to make cruising and city driving relatively easy. The torque curve peaked early, making it quite confortable for daily city-driving, but the lack of horsepower will often give you a hard time overtaking other vehicles at higher speeds.

As you have probably noticed by now, by no means this was a perfomance-oriented engine. Should you need more power while still enjoying good fuel consumption, consider looking for later developed diesel powertrains, namely the 730d variant (3.0L I6 turbo diesel - 184/193hp) and also the 740d version (4.0L V8 biturbo diesel - 248hp).

E38 725tds owners ofter reported injection pump failure, mostly due to the hydraulic head going bad. This is a well established weak spot of this engine, widely covered on dedicated E38 groups. Best advice is to do a preventive replacement or at least to conduct inspection periodically. If serviced and maintained accordingly, the M51 will do its job even after reaching half a million kilometers.

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Acceleration

Fuel Consumption - main "feature" of the M51

One of the main advantages of the M51 diesel engine in the BMW 725tds was its fuel efficiency, which was a key selling point for this model. The combination of a diesel engine and turbocharging allowed the 725tds to offer far better fuel economy than its petrol-powered counterparts, while sacrificing some dynamics.

• Fuel Consumption (combined): 8-9 liters / 100 kilometers (roughly 26-30 mpg)
• Fuel Tank Capacity: 85 liters (22.5 gallons)

For a large luxury sedan like the E38, these figures were quite impressive and made the 725tds a good choice for buyers looking for a balance between luxury and fuel efficiency, particularly in Europe, where smaller displacement diesel engines are considered to be more popular due to lower fuel costs/taxes

It is to be noted that the US/UK markets did not get any diesel powetrains. While UK did get some economically oriented variants - such as 728i (2.8L I6 petrol) or 730i (3.0L V8 petrol)- the US market only had two E38 powertrains to chose from - 740i/L (4.0/4.4L V8 petrol) and the flagship 750i/L (5.4L V12), two quite petrol-thirsty machines.

2. The E38 730d

The BMW E38 730d, introduced in 1998, was the first diesel-powered model in BMW's flagship 7 Series lineup to feature a common-rail direct injection system, setting it apart as a more modern and efficient diesel option.

Engine Overview

The BMW E38 730d is powered by the M57D30 engine, a 3.0-liter inline-six (I6) turbodiesel. This engine marked a new era for BMW diesels, introducing common-rail direct injection, which greatly improved fuel efficiency and power delivery compared to older diesel engines. The M57 was renowned for its robust construction, power delivery, and a more quiet idle, providing a significant upgrade over the earlier M51 engine found in models like the 725tds.

Performance

The 730d E38 was in fact equipped with two different engines, depending of the year of production.

1998 - mid 2000's, the 730d delivered 184 horsepower (135 kW) at 4,000 rpm and 410 Nm of torque (302.4 lb-ft) @ 2000 rpm. The engine's torque delivery at low revs made it ideal for effortless highway cruising and provided a quite good acceleration even in a car as large as the E38 7 Series. For EU readers, as of the emissions, this was a certified Euro 2 engine.

• Power Output: 184 hp (135 kW) at 4,000 rpm
• Torque: 410 Nm (302.6 lb-ft) at 2000 rpm
• 0-100 km/h (0-62 mph) Acceleration: 9.2 seconds
• Top Speed: 220 km/h (136.7 mph)

Late 2000's - 27th July 2001 (end of production), power was bumped from 184hp (135 kW) to 193hp (144kW), and the overall emissions were improved (for EU readers, M57D30 was now classified as an Euro 3 engine).

• Power Output: 193hp (144 kW) @ 4,000 rpm
• Torque: 430 Nm (317.15 lb-ft) @ 2000 rpm
• 0-100 km/h (0-62 mph): 8.9 seconds
• Top Speed: 220 km/h (136.7 mph)

Regarding the reliability, the M57D30 was (and it still is) an unbelievably robust engine, but not bulletproof. There are no truly fragile components, but as any older engine without proper maintenance, it can fail. In case any repair is needed, the fact that it was widely equipped across many BMW platforms makes finding spare parts easier than ever. This also applies for any engine upgrades/mods you plan on doing.

While many owners might be tempted to do some power-oriented modifications, keep in mind that the gearbox used in the 730d - a ZF 5HP24 5-speed automatic (regardless of the year of production)- was not made for handling much more torque. Originally made for the E38 V8's, it was then paired with the later developed 730d (production starting from 1999), and was certainly not designed for handling anything above 450Nm (331.9 lb-ft). No manual gearbox was available on the 730d, so you will probably want to settle with stock power, unless you don't mind swapping another gearbox in. 

However, the engine itself easily handles more power. In EU, it is the go-to diesel engine in terms of 'in-house' substantial power modifications, as some owners have reportedly increased their M57D30's power to over 400hp(298.2 kW).

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Acceleration

Fuel Consumption

One of the standout features of the BMW E38 730d is its excellent fuel efficiency-performance ratio, thanks to the introduction of common-rail direct injection, allowing for more precise control of fuel delivery, resulting in better fuel economy without sacrificing performance.

• Fuel Consumption (combined): 7-8 liters/100 kilometers (around 35-40 mpg)
• Fuel Tank Capacity: 85 liters (22.5 gallons)

For a large luxury sedan, these fuel economy figures were impressive, making the 730d E38 a popular choice for drivers looking for a balance of performance and efficiency, especially for long-distance or frequent driving.

Given its quite generous power output, good torque, excellent fuel consumption and the lack of reliability issues, enthusiasts consider the 730d as the best diesel alternative the E38 chassis offers. While for most users this is generally true, neither the 725tds nor the 740d cannot be ruled out of question. The 725tds is the only diesel powertrain that also comes with a manual tramsission, and the 740d's unique V8 biturbo diesel feeling is something to take into consideration.

After all, the choice is yours to make. But before jumping on a deal, it is good to have all key aspects sorted our, so in the end you will be the proud owner of a BMW masterpiece that perfectly suits your needs.

3. The E38 740d

The BMW E38 740d, introduced in 1999, was a groundbreaking model for BMW, as it was the first 7 Series to feature a V8 turbodiesel engine. This model represented BMW's commitment to combining luxury, performance, and fuel efficiency. Powered by the advanced M67D40 engine, the 740d offered significant power and torque while maintaining good fuel economy. The 740d stood out in the diesel luxury car segment mainly due to its powerful yet fuel efficient V8 engine.

Engine Overview

The BMW E38 740d was equipped with the M67D40 engine, a 4.0-liter V8 turbodiesel. This was a significant step up from the inline-six diesel engines previously used in the E38, marking BMW's first venture into V8 diesel technology. The M67 engine was designed to provide the substantial power delivery and refined performance expected of a luxury V8, but with the added fuel efficiency of a diesel. This engine was a marvel of engineering at the time, offering immense torque and power while remaining relatively fuel-efficient. Plus, you get to enjoy the unique V8 diesel purr.

Performance

The M67D40 engine delivered an impressive 245 horsepower (180 kW) at 4,000 rpm and an outstanding 560 Nm of torque (413 lb-ft) at 1,750-2,500 rpm. This significant increase in torque figure made the 740d incredibly capable at highway speeds, allowing for effortless overtaking and great acceleration even at lower RPMs. The V8 configuration provided consistent delivery of power, which is essential for maintaining the luxury feel of the 7 Series, as the dual turbocharging ensured that the performance remained consistent across the rev range.

• Power Output: 245 hp (180 kW) @ 4,000 rpm
• Torque: 560 Nm (413 lb-ft) @ 1,750-2,500 rpm
• 0-100 km/h (0-62 mph): 8.4 seconds
• Top Speed: 242 km/h (150 mph)

The 740d's combination of V8 power and diesel fuel efficiency meant it could comfortably handle high-speed cruising, while also providing the necessary torque for swift and smooth acceleration. This made the 740d an ideal choice for those looking for luxury, performance, and long-distance capability in one package.

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Acceleration

Fuel Consumption

One of the most appealing aspects of the BMW 740d was its balance between power and fuel efficiency. Despite being equipped with a powerful V8 engine, the 740d managed to offer impressive fuel economy for a car of its size and performance level. The M67's rather generous displacement and dual turbocharging, combined with BMW's advanced diesel tehnology, contributed to a relatively low fuel consumption, especially on long highway journeys.

• Fuel Consumption (combined): 9-10 liters per 100 kilometers (around 28-31 mpg)
• Fuel Tank Capacity: 85 liters (22.5 gallons)

Given its size, weight, and performance, the fuel economy figures were remarkable, especially considering the substantial power and torque output of the engine. The 740d became a popular choice for those who required both power and efficiency in a luxury sedan.

Also, taking into consideration that production only began in 1999, this is a quite rare E38. Only around 3450 units were ever made. This also means that if maintenance or repair is needed, parts can be quite hard to find. Being a rather complex V8 biturbo diesel, few mechanics know how to properly fix these engines, so be sure you get qualified help when dealing with such repairs.

Reliability and Maintenance

The M67 engine in the BMW 740d was designed for durability and long-term reliability, but as with any high-performance diesel engine, regular maintenance was key to ensuring its longevity. Common maintenance tasks included:

• Turbocharger care: As with all turbocharged engines, these tend to fail overtime and finding compatible replacements is a bit of a hassle.
• Fuel system maintenance: Regular replacement of fuel filters is key to clogging prevention in the high-pressure common-rail injection system.

While the M67 engine was generally reliable, potential issues could arise with the turbochargers or the common-rail fuel injection system over time, especially if the vehicle wasn't properly maintained.

Cool factor

Out of the 3 diesel powertrains available on the E38 chassis, we believe that the M67D40 stands out the most, considering its performance, sound and uniqueness of a V8 biturbo diesel in a luxury sedan.

The 740d E38 is also one of the rarest E38 variants, given that around 3450 units were ever produced (worldwide).

Petrol

1. The E38 728i/L

The BMW E38 728i is often the unsung hero of the legendary E38 7 Series lineup. 

While everyone tends to drool over the monstrous V8s and V12s, or choose the conservative, rather economical diesel powetrains, the 728i quietly stood its ground, offering a sweet balance of luxury, efficiency, and that signature BMW driving experience. Sure, it's the entry-level model (along with the 725tds), but this isn't just any entry-level car—this is a 7 Series, where "entry-level" still means you're rolling in style, comfort, and precision.

Engine Overview

Under the hood of the BMW E38 728i, you've got BMW's iconic 2.8L I6 M52 engine—arguably one of the best inline-six engines the german brand ever made, more precisely known as the M52B28 and later the M52TUB28. With 2.8 liters of naturally aspirated smoothness, the M52 gives you 193 horsepower and 280 Nm of torque. It may not sound like much compared to the bigger engines in the lineup, but don't let those numbers fool you. This engine is crafted for those that are all about that smooth, refined power delivery that BMW's inline-sixes are known for, making it a pleasure to drive around without spending a fortune. 

Performance 

The rear-wheel-drive setup, found on all E38's, combined with the balanced chassis that BMW did so well, means the 728i handles way better than you'd expect for a luxury sedan of this size. It's nimble for a big car, with excellent weight distribution, making it more of a driver's car than most people would think. BMW's focus on making their cars engaging to drive is evident here, even though the 728i was the "baby" of the bunch.

It's not just about the power—it's how the car uses it. The M52 engine is paired with a suspension setup that makes the car feel connected to the road, something that's quite rare for a luxury sedan. You get a car that feels comfortable on long highway trips but is also responsive and fun when you hit those back roads. For enthusiasts, the 728i gives you a taste of everything BMW does best, just in a more understated package.

• Power Output: 193 hp (144 kW) @ 5,300 rpm
• Torque: 280 Nm (206.5 lb-ft) @ 3,950 rpm
• 0-100 km/h: 9 seconds
• Top Speed: 230 km/h (143 mph)

It's nowhere near a track car, but the 728i isn't about sprinting—it's about delivering that perfect flow of power right when you need it. Whether you're cruising down the highway or taking a winding road, this inline-six is there to make the experience silky smooth.

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Acceleration

Fuel Consumption

One of the key points about the BMW 728i is that owners don't have to deal with the thirsty fuel habits of the larger V8s and V12s. This inline-six was built with efficiency in mind, and it shows.

• Fuel Consumption (combined): 8-9 L/100 km (31-35 mpg)
• Fuel Tank Capacity: 85 liters (22.5 gallons)

However, the fuel efficiency drops when exploited through city traffic - 14.5L/100km (17-20 mpg)

This makes the 728i a great choice if you want a luxury cruiser but don't want to empty your wallet at the gas station. For long road trips, it's a real winner, especially when combined with the general comfort and refinement of the 7 Series.

Reliability and Maintenance

The M52 and M52TUB28 engines were generally regarded as reliable, provided they were properly maintained. As with any older BMW, regular servicing was crucial to ensuring longevity. Key areas to watch for included:

• Cooling System: One of the common maintenance areas for the M52 engine was the cooling system, particularly the radiator and water pump, which could wear over time.
• VANOS System: The VANOS system, particularly in the M52TUB28, was another component that could require attention, mainly due to the aging of the seals.
• Oil Leaks: The M52 engines were known for potential oil leaks around the valve cover gasket and oil filter housing, but these were generally inexpensive and easy to fix if caught early.

With proper care and maintenance, the 728i could easily cover high mileage, and many examples of this model are still on the road today, a testament to its durability and the quality of BMW's engineering.

2. The E38 730i/L

The BMW E38 730i was a real turning point in the 7 Series lineup, especially when compared to its predecessor. Unlike the previous generation, e32 730i, which had an inline-six, the E38 model introduced something special—BMW's smallest displacement V8 engine - 2997cm3. As a result, the 730i got a significant upgrade under the hood with the introduction of a 3.0-liter V8, marking a big step forward in terms of refinement. Though it was the smallest V8 in BMW's arsenal, this engine brought a whole new level of driving experience to the 730i, adding a bit more growl and power without sacrificing the balance that 7 Series enthusiasts love.

Engine Overview and Specs

The heart of the E38 730i is the M60B30 —BMW's smallest V8s at 2997cm3. This marked a significant departure from the inline-six of the previous generation 730i, giving the car more grunt and refinement. The M62B30 produced 218 horsepower (160 kW) at 5,700 rpm and 290 Nm of torque (214 lb-ft) at 3,900 rpm. While this might seem modest for a V8, it provided the 730i with smoothness and effortless power delivery that only a V8 can offer, and it made for a much more luxurious and dynamic driving experience compared to its inline-six predecessors. 

• Power Output: 218 hp @ 5,700 rpm
• Torque: 290 Nm @ 3,900 rpm
• 0-100 km/h: 8.5 seconds
• Top Speed: 230 km/h (143 mph)

Buyers shall consider that this 3.0-liter V8 is all about balance—enough power to make the E38 feel lively, with a reasonable, linear power delivery across the rev range. Truth is this is not a fire-breathing beast, but it's got that signature BMW V8 sound, with the extra punch you'd expect from an eight cylinder. 

Power and Performance

Switching from an inline-six to a V8 might not sound like a massive leap, but it made a world of difference for the 730i 7 Series. The V8 transformed the way the car drove, as expected. It wasn't just about more horsepower—it was about the sheer driving pleasure and torque you get from a well-built V8, especially at lower revs. The M60/M62V8 gave the 730i a relaxed but confident powerband that made everyday driving easier and more enjoyable, whether you were cruising on the highway or navigating through city streets.

The 730i's rear-wheel-drive layout, paired with this engine, meant you had the perfect balance of performance and handling. The V8 also brought with it that unmistakable sound—a refined growl when you pushed it but a quiet hum during cruising. This made the car feel powerful, yet incredibly composed, a hallmark of BMW's best luxury sedans.

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Acceleration

Fuel Efficiency

One of the claimed advantages of the 3.0-liter V8 is that BMW engineered the M60B30/M62B30 to be as efficient as possible, and the result was a car that didn't guzzle fuel like larger V8s but still delivered the performance expected of a luxury sedan. However the diference is not very substantial.

Here is a fuel consumption comparision - 730i vs 735i vs 740i E38 - all petrol-powered V8 engines offered on the E38 chassis.

730i (M60B30)

• Urban - 14.9 l/100 km (15.7 mpg)
• Extra urban - 8 l/100 km (29.4 mpg)
• Combined - 10.8l/100 km (21.8 mpg)

735i (M62B35)

• Urban - 18 l/100 km (13 mpg)
• Extra urban - 8.9 l/100 km (26 mpg)
• Combined - 12.3 l/100 km (19 mpg)

740i (M62B44)

• Urban - 18.6 l/100 km (12.6 mpg)
• Extra urban - 8.9 l/100 km (26.4 mpg)
• Combined - 12.5 l/100 km (18.8 mpg)

For a V8-powered luxury sedan, these numbers were pretty impressive. You got all the perks of having a V8 under the hood without the huge fuel bills, making the 730i an attractive option for those who wanted power and prestige without the running costs of the larger-engined models in the range.

V8 Engineering and Technology

BMW's M60B30 V8 engine in the 730i came with a host of modern features designed to boost both performance and efficiency. This was not just about adding two more cylinders—it was about creating an engine that was smoother, more powerful, and more refined than the inline-six that came before it. Key technologies included:

• Aluminum Block and Cylinder Heads: The M60 engine was lighter and more compact than previous V8s, which helped keep the car's weight down, improving handling and efficiency.
• The M60 engine has double overhead camshafts with four valves per cylinder.
• Valves had hydraulic lash adjustment to reduce maintenance.
• The ignition system is a coil-on-plug design with knock sensors.
  
• BMW's first car engine to use a "split conrod" design: sintered connecting rods are made as a single piece and then fractured in order to ensure increased rigidity and an exact fit.
  
• Bosch Motronic 3.3 Engine Management System: This advanced system helped control fuel injection and ignition timing, further optimizing performance and fuel economy.

The 730i wasn't trying to be a sports sedan like its more powerful siblings, but that wasn't the point. It was about focusing on luxurious driving experience, with just enough punch to remind you that you've got a V8 under the hood. And with the E38's suspension and chassis, you had a car that was not only comfortable but also nimble enough to make even everyday driving a joy.

Reliability and Common Issues

The V8 engine in the 730i was known for being reliable, provided you kept up with regular maintenance. As with any BMW V8 from this era, the key was staying on top of routine servicing to avoid issues down the line. Some things to watch out for included:

• Cooling System: Like many BMWs, the cooling system (radiator, water pump, and thermostat) can be a weak point, so regular checks and replacements are important to avoid overheating.
• Oil Leaks: The valve cover gaskets and timing chain covers can develop oil leaks as the car ages, but these are relatively straightforward to fix.
• Timming chain guides: This is a common weak link of the V8's produced by BMW in this era. The plastic timing chain guides in the M60 engine are known to wear down over time. If left unchecked, this can cause timing chain noise (a rattling sound) and, in the worst-case scenario, lead to catastrophic engine damage. Replacing the timing chain guides is labor-intensive but essential for long-term reliability.

• Mass Airflow Sensor (MAF) Issues: The MAF sensor can fail or become dirty over time, leading to poor engine performance, reduced fuel economy, and rough idling. Cleaning or replacing the sensor can resolve this.

• Oil Leaks from the Timing Chain Cover: Oil can also leak from the timing chain cover, which is another common issue that arises as the car ages. If not caught early, these leaks can lead to low oil levels and engine performance issues.

Despite these common maintenance issues, the M60 engine in the E38 730i is generally regarded as a solid performer with the potential to cover high mileage if cared for properly.

Conclusively, it is indeed crafted for those who do not mind a little bit less power while still enjoying the characteristic purr of a V8, at a considerably lower price than its competitors - the 740i/L or the 750i/L.

3. The E38 735i/L

The BMW E38 735i represents a solid middle ground in the E38 7 Series lineup, offering a combination of luxury, performance, and sophistication. It was paired with an M62B35 engine, and later the VANOS-upgraded M62TUB35, both overall great engines. 

One question that might arise is -  did BMW E38 really need such V8 considering it already had a 730i and a 740i in its lineup? Enthusiast answered - and it was a yes. 28,444 units were equipped with this engine worldwide. Keep in mind that US car marked did never get such engines.

Engine Overview and Specs

The M62B35 engine in the E38 735i was part of BMW's M62 family of V8 engines, featuring a DOHC (Dual Overhead Camshaft) configuration and 32 valves (four valves per cylinder), which improved airflow and combustion efficiency. This was a naturally aspirated engine known for decent power delivery and responsiveness across the rev range. It also featured Bosch Motronic 5.2 engine management, which optimized fuel injection and ignition timing for better performance and fuel efficiency.

Early production E38's (1996-1998) were equiped with a non-VANOS M62B35, producing 235hp (173kW) and 320 Nm (236 lb-ft) of torque.

In the later models (1998-2001), the M62TU (Technical Update) version introduced Double-VANOS (variable valve timing on both intake and exhaust), enhancing torque at lower RPMs and improving fuel efficiency. This made the engine more responsive and efficient, especially in day-to-day driving. While power was only bumped with 3hp, the torque figures went from 320 Nm (236 lb-ft) to 345 Nm (254 lb-ft).

Power and Performance

Here's a short breakdown of the BMW E38 735i's engine capabilities:

M62B35

• Horsepower: 235 hp (173kW) @5,700 rpm
• Torque: 320 Nm (236 lb-ft) @ 3,900 rpm
• 0-100 km/h (0-62 mph): 8 seconds
• Top Speed: 240 km/h (143 mph)

M62TUB35

• Horsepower: 238 hp (177.5 kW) @ 5,700 rpm
• Torque: 345 Nm (254 lb-ft) @ 3,800 rpm
• 0-100 km/h (0-62 mph):  7.5 seconds
• Top Speed: 242 km/h (150 mph)

Sound

Acceleration

Fuel efficiency

AS you would expect, the 735i/L sits right in the middle, with the overall consumption lower that the 740i but still highter that the 730i. Intresting fact, comparing the 3.5i to its bigger brother, the 740i M62B44, you will find the difference is rather unnoticeable. So perheaps, you would be better off with buying the more powerful version, if power is your thing.

• Urban - 18 l/100 km (13 mpg)
• Extra urban - 8.9 l/100 km (26 mpg)
• Combined - 12.3 l/100 km (19 mpg)

vs the 740i M62B44

• Urban - 18.6 l/100 km (12.6 mpg)
• Extra urban - 8.9 l/100 km (26.4 mpg)
• Combined - 12.5 l/100 km (18.8 mpg)

From an enthusiast standpoint, the 740i is generally a bit more appreciated that the 735i since it is esentially the most powerful V8 available on the E38 7 Series, this often resulting in a higher asking price. Also keep in mind that very few E38 740i's were paired with a manual gearbox (2.371 units), therefore being considered by the collectors as the most saught-after V8 configuration available on the E38 chasis. If you managed to grab one of this driving-oriented masterpieces, consider yourself lucky - you got a true gem on your hands.

The E38 735i also was available with a manual transmission, with a total of around 4000 units produced in this configuration, so still a pretty rare E38 nevertheless.

Reliablity and Common Issues

While the M62B35 V8 engine was known for its reliability and longevity, there were several areas that could develop problems over time, particularly as the car aged:Cooling System Failures: Like many BMWs from this era, the cooling system in the 735i can be a weak point. Components like the water pump, radiator, and thermostat are prone to failure and should be replaced preemptively to avoid overheating, which could lead to more severe engine damage.

• Cooling System Failures: Like many BMWs from this era, the cooling system in the 735i can be a weak point. Components like the water pump, radiator, and thermostat are prone to failure and should be replaced preemptively to avoid overheating, which could lead to more severe engine damage.

• VANOS Unit Failures: In models with Double-VANOS, the system can become noisy or fail over time, particularly if oil changes are neglected. This can result in poor low-end torque and rough idling, but it is repairable with replacement seals or unit refurbishment.
• Valve Cover Gasket Leaks: The M62 engine is known to develop oil leaks around the valve cover gaskets as they age, which can lead to oil dripping onto hot engine parts, causing burning smells or even smoke. Regular inspections can catch this early.
• Timing Chain Guide Wear: A more serious issue, the plastic timing chain guides in the M62 engine are known to wear down over time. If left unchecked, this can cause timing chain noise (a rattling sound) and, in the worst-case scenario, lead to catastrophic engine damage. Replacing the timing chain guides is labor-intensive but essential for long-term reliability.
• Mass Airflow Sensor (MAF) Issues: The MAF sensor can fail or become dirty over time, leading to poor engine performance, reduced fuel economy, and rough idling. Cleaning or replacing the sensor can resolve this.
• Oil Leaks from the Timing Chain Cover: Oil can also leak from the timing chain cover, which is another common issue that arises as the car ages. If not caught early, these leaks can lead to low oil levels and engine performance issues.

4. The E38 740i/L

The BMW E38 740i is considered to be the sweet spot in the 7 Series lineup, offering a perfect blend of V8 power and luxury that appeals to enthusiasts who want serious performance without the V12 costly extravagance. 

Engine overview and specs

The 740i E38 featured two engine variants during its production: the M60B40 (4.0-liter V8) from 1994-1996 and the M62B44 (4.4-liter V8) from 1996 onwards. In 1998, a "Technical Update" was applied to the M62, resulting in the M62TU variant. New features include single-VANOS (variable valve timing for the intake camshaft) and electronic throttle control. The engine management was updated to Motronic ME7.2.

Power remained the exact same across all updates, but torque figures had slightly improved, as shown in the comparision below:

Power and Performance

• 1994–1996 4.0 L M60B40 V8 - 210 kW (286 hp) 400 Nm (295 lb⋅ft)
• 1996–1998 4.4 L M62B44 V8 - 210 kW (286 hp) 420 N⋅m (310 lb⋅ft)
• 1998–2001 4.4 L M62TUB44 V8 - 210 kW (286 hp) 440 N⋅m (325 lb⋅ft) 

As the enhusiasts of such engines have pointed out, the M60 has the most aggressive cams but the smallest displacement and no VANOS. Good torque, but it really hits in the midrange and revs well. In stock form it peaks around 5800 RPM but can be uncorked significantly with effective intake and exhaust work. The M62 makes more torque with milder cam timing and the increased displacement, but peak power is only slightly greater than the M60. Generally its pretty much done by 5800 RPM. The M62TU uses VANOS and a more low-end oriented intake manifold to produce more  torque but it doesn't rev like the M60 or M62. In stock form peak power is around 5400 RPM.

M60B40 

• Acceleration 0 - 100 km/h (0 to 62 mph) : 6.9 s 
• Top Speed : 250 km/h / 155 Mph

M62B44

• Acceleration 0-100km/h (0 - 62 mph) : 6.7 sec
• Top speed : 250 km/h / 155 Mph

M62TUB44

• Acceleration 0-100km/h (0 - 62 mph) : 6.3 sec
• Top speed : 250 km/h / 155 Mph

Sound

Acceleration

Fuel Efficiency

Despite the V8's power, the BMW 740i manages respectable fuel efficiency for its class. With fuel consumption figures hovering around 12 liters/100 kilometers (approximately 20-23 mpg), the 740i stands relatively good for a full-sized luxury sedan with good performance. However, if your driving mainly consists of getting through heavy traffic, you might need a premium fuel station subscription, since fuel consumption will go up, quick.

General fuel consumption stats (no notable differences between engine variants):

• Urban - 18.6 l/100 km (12.6 mpg)
• Extra urban - 8.9 l/100 km (26.4 mpg)
• Combined - 12.5 l/100 km (18.8 mpg)
• Fuel Tank Capacity: 85 liters (22.5 gallons)

While it's not the most efficiency-oriented car, the balance between performance and luxury makes the 740i a desirable car for those in need of a fantastic long-distance cruiser.

Reliability and Common Issues

While the M62 engine is known for its reliability, there are a few common issues to be aware of:

• Cooling System: Like other BMWs from this era, the cooling system (especially the water pump, radiator, and thermostat) is a known weak spot. Preventive maintenance is key to avoiding overheating, or worse.
• Timing Chain Guide Failure: The plastic timing chain guides can wear down over time, leading to a rattling noise and potentially serious engine damage if not addressed.
• Oil Leaks: Valve cover gaskets and timing chain cover leaks are common, though relatively easy to fix if caught early.
• VANOS Unit: The Double-VANOS system (in later models) may fail, causing power loss at low RPMs and rough idling.

5. The E38 750i/L 

The BMW E38 750i is the pinnacle of the 7 Series lineup, a true flagship combining opulence and raw V12 power. Powered by the mighty M73B54 5.4-liter V12 engine, it delivers 326 horsepower and 490 Nm of torque, pushing this luxury beast from 0-100 km/h in just 6.6 seconds. With effortless acceleration, silky-smooth power delivery, and an engine known for its refinement, the 750i represents the ultimate in BMW luxury performance.

Performance

The E38 750i sits at the top of the lineup, and it feels every bit like the flagship it was meant to be. With a rear-wheel-drive layout and BMW's signature chassis balance, the 750i offers a surprisingly composed and refined driving experience for a car of its size and weight. But where the six-cylinder models were nimble and understated, the V12 brings an entirely different flavor—effortless power and silky delivery.

This isn't about raw aggression—it's about smooth, unrelenting torque. The M73 V12 engine is a masterpiece of refinement, designed more for grand touring comfort than outright sportiness, but it still delivers when asked. Thanks to its near-silent power delivery and seamless throttle response, the 750 glides down highways with authority, yet remains composed on twisty roads. It's not agile in the traditional sense, but it's remarkably stable and predictable—a true autobahn cruiser with real-world power.

• Power Output: 326 hp (240 kW) @ 5,000 rpm
• Torque: 490 Nm (361 lb-ft) @ 3,900 rpm
• 0-100 km/h: 6.6 seconds
• Top Speed: 250 km/h (155 mph, electronically limited)

It may not be a sports car, but the 750 V12 isn't trying to be. What it offers instead is a seamless wave of power, a near-silent cabin, and the kind of presence and refinement that few sedans of its era (or even today) can match. The E38 750 isn't just a luxury car - it's an experience.

Sound

Acceleration

Fuel Consumption

Fuel economy was never the E38 750i's strong suit—and it doesn't pretend otherwise. With a 5.4-liter V12 under the hood, sipping fuel modestly was not on the design brief. But for what it is—a full-sized luxury sedan with 12 cylinders and effortless performance—the 750i manages respectable consumption figures, especially on long highway stretches.

You'll notice the difference most in city traffic, where the V12's thirst becomes apparent. But on the open road, the engine settles into a smooth, low-rev rhythm that makes cross-country cruising surprisingly efficient for such a big engine. If you're regularly commuting through dense traffic, though, be prepared: premium fuel and frequent fill-ups come with the badge.

Fuel Consumption:

• Urban: 20.0 l/100 km (11.8 mpg)

• Extra Urban: 10.2 l/100 km (23.1 mpg)

• Combined: 14.2 l/100 km (16.6 mpg)

• Fuel Tank Capacity: 85 liters (22.5 gallons)

While far from economical by modern standards, the 750i offers a perfect blend of comfort, prestige, and performance, justifying its fuel needs with an experience that few other sedans can replicate. If you're behind the wheel of a V12, chances are, you're not counting every drop, but enjoying every mile.

Reliability and Common Issues

The BMW M73 V12 powering the E38 750i is known for its refinement and smooth operation, but it also brings complexity and higher maintenance expectations. While generally robust if well-maintained, the 750i does come with its own set of common issues—mostly due to the age and complexity of the V12 engine and the systems supporting it.

Common Issues with the V12:

• Cooling System
  Like most BMWs of this era, the cooling system is a weak point. The water pump, radiator, and thermostat can fail and lead to overheating if not addressed early. With the added heat and space constraints of a V12, cooling issues are even more critical on the 750i than on its V8 or inline-six siblings.

• Throttle Bodies and Drive-by-Wire System
  The M73 uses two throttle bodies (one for each bank of cylinders), controlled electronically. These can fail or become sluggish with age, causing hesitation or rough idle. Cleaning or replacing the throttle actuators can solve the issue, but diagnosing them can be tricky.

• Ignition System
  With 12 individual coils and spark plugs, ignition maintenance is more expensive than on smaller engines. Misfires can occur if coil packs or plugs wear out. Regular service is crucial to keeping the engine smooth.

• Vacuum Leaks and Intake Gaskets
  Old rubber hoses and intake manifold gaskets are prone to cracking and leaking over time. These can cause poor fuel economy, rough idle, or check engine lights. It's a common age-related issue that requires patience and precision to track down on a tightly packed V12.

• Oil Leaks
  Valve cover and upper timing cover gasket leaks are fairly common. Given the V12 layout, even small leaks can turn into labor-intensive repairs, especially if they drip onto exhaust components.

• Electronic Gremlins
  Being a flagship model, the 750i is packed with electronics—from soft-close doors to complex climate and seat control modules. These systems can fail with age and are often expensive or difficult to replace without sourcing used parts