Engine BMW M73B54

The 5.4-liter 12-cylinder BMW M73 or M73B54 engine was produced from 1994 to 2002 and was installed on the top models of the concern: the 7-Series sedan, 8-Series coupe and Rolls-Royce Silver Seraph. In 1998, an updated version of the motor appeared, it is distinguished by the index M73B54TU or M73TU.

The engine was installed on:

  • BMW 7-Series E38 in 1994 – 2001;
  • BMW 8-Series E31 in 1994 – 1999;
  • Rolls-Royce Silver Seraph 1 in 1998 – 2002.


Production years 1994-2002
Displacement, cc 5379
Fuel system distributed injection
Power output, hp 326
Torque output, Nm 490
Cylinder block aluminum V12
Block head aluminum 24v
Cylinder bore, mm 85
Piston stroke, mm 79
Compression ratio 10.0
Features no
Hydraulic lifters yes
Timing drive chain
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 8.5
Fuel type petrol
Euro standards EURO 3
Fuel consumption, L/100 km (for BMW 750iL 1995)
— city
— highway
— combined
Engine lifespan, km ~350 000

Disadvantages of the M73B54 engine

  • First of all, owners should not be embarrassed by fuel consumption of 20 liters per 100 km;
  • The main reason for the unstable operation of the motor is air leakage in the intake;
  • Closer to 200 – 250 thousand km, the timing chain often needs to be replaced along with sprockets;
  • Also, on runs over 200,000 km, this power unit already decently consumes oil;
  • Still here, leaks of the water pump or the rear crankshaft oil seal are often found.

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