The BMW M73 B54 is a 5,379 cc, V12 naturally aspirated petrol engine produced between 1996 and 2001. It featured dual overhead camshafts (DOHC), 48 — valve configuration, and individual throttle bodies, delivering 240 kW (326 PS) and 490 Nm of torque for flagship luxury applications. This engine used electronic throttle control (Drive — by — Wire) and single VANOS variable valve timing for improved responsiveness.
Fitted exclusively to the E38 7 Series (750i/iL) and E31 8…
Bmw
Production years 1996–2001 meet Euro 3 emissions standards .
The BMW M73 B54 is a 5,379 cc V12 naturally aspirated petrol engine engineered for flagship luxury platforms (1996–2001). It combines a 48-valve DOHC layout with individual throttle bodies and single VANOS to deliver silent, linear power delivery and high-RPM refinement. Designed to meet Euro 3 standards, it represents the pinnacle of BMW's naturally aspirated V12 engineering.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,379 cc | |
Fuel type | Petrol | |
Configuration | V12, DOHC, 48-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 81.0 mm | |
Power output | 240 kW (326 PS) @ 5,200 rpm | |
Torque | 490 Nm @ 3,900 rpm | |
Fuel system | Sequential multipoint fuel injection (SME) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (DOHC) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 252 kg |
The BMW M73 B54 was used across BMW's E38/E31 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-increased cooling capacity in the E38 and revised intake manifolds in the E31-and from 1998 the updated crankshaft position sensor with improved thermal shielding, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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The M73 B54 is mechanically robust with excellent longevity when properly maintained. Early models (1996-1998) are prone to crankshaft position sensor failure, but post-1998 revisions resolved this with improved thermal shielding. Regular coolant changes (every 2 years), use of correct BMW Longlife-98 oil, and attention to vacuum hoses ensure long-term reliability. The strong V12 architecture supports high mileage with minimal wear when serviced correctly.
Primary issues include crankshaft position sensor failure (especially pre-1998), VANOS solenoid faults, coolant leaks from the expansion tank, and oil leaks from the valve cover and rear main seal. These are well-documented in BMW service bulletins and stem from material aging, thermal stress, and maintenance neglect. The 1998 sensor update significantly improved system durability.
The M73 B54 was used in the E38 7 Series (750i, 750iL) and E31 8 Series (850Ci). It was BMW's flagship naturally aspirated V12 during this era, offering ultimate refinement for luxury sedans and coupes. No licensed applications outside BMW. The engine was succeeded by the M73TU and later N73 engine families.
Yes, though naturally aspirated. Bolt-on modifications like performance intake, exhaust, and chip tuning can yield modest gains (10-15%). Aggressive camshafts and porting are possible for higher output. The engine's strong bottom end supports moderate increases, but gains are limited without forced induction. Enthusiasts often pair ECU tuning with free-flow exhausts for improved throttle response and mid-range torque.
In combined driving, expect 18.0–22.0 L/100km (16–13 mpg UK). Highway cruising can achieve ~15.0 L/100km (~19 mpg UK), while city driving may exceed 25.0 L/100km (11 mpg UK). Real-world figures depend on driving style and vehicle weight, with E31 models generally less efficient than E38. The V12's refinement comes at the cost of high fuel consumption compared to smaller engines.
Yes. The M73 B54 is an interference engine. If the timing chain fails or skips, pistons will contact open valves, causing catastrophic internal damage. While the double-row roller chain is durable, any signs of wear or noise should be investigated immediately to prevent engine seizure. Regular oil changes help maintain chain tensioner function and lubrication.
BMW specifies SAE 10W-40 oil meeting BMW Longlife-98 standard. Use a high-quality synthetic or semi-synthetic designed for petrol engines. Change oil every 15,000 km or 2 years to protect the VANOS system and timing chain. Proper lubrication is essential for long-term reliability, especially under sustained load or high-temperature operation.
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Regulation (EC) No 715/2007
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