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BMW M50 engine – six-cylinder piston engine with two overhead camshafts, which was submitted in January 1989 on 5-Series E34, and thus replacing the previously installed 2-valve M20. A little later, this engine was installed on the BMW 3 Series E36 (sedan, touring, coupe, convertible, and Baur).

BMW M50 engine is available in two versions, with a volume of 2.0 and 2.5 liters, and is produced in the Steyr factory. Until 1996, all 943,795 engines were produced.

BMW M50B20 Engine Specs

Manufacturer  Munich Plant
Also called BMW M50
Production 1990-1996
Cylinder block alloy Cast iron
Configuration Straight-6
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 66 (2.6)
Cylinder bore, mm (inch) 80 (3.15)
Compression ratio 10.5
11 (TU)
Displacement 1991 cc (121.5 cu in)
Power output 110 kW (150 HP) at 6,000 rpm
110 kW (150 HP) at 5,900 rpm (TU)
Torque output 190 Nm (140 lb·ft) at 4,700 rpm
190 Nm (140 lb·ft) at 4,200 rpm (TU)
Redline 6,500 rpm
HP per liter 75.3
Fuel type Gasoline
ECU Bosch Motronic 3.1
Siemens MS40.0
Siemens MS40.1 (TU)
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)
for E36 320i
11.2 (21)
6.7 (35.1)
8.6 (27.4)
Turbocharger   Naturally aspirated
Oil consumption, L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil 5W-30, 5W-40, 10W-40, 15W-40
Engine oil capacity, L (qt.) 5.75 (6.0)
Oil change interval, km (miles)  7,000-10,000
Normal engine operating temperature, °C (F) ~90 (194)
Engine lifespan, km (miles)
-Official information

400+ (250+)
Tuning, HP
-Max HP
-No life span loss

BMW M50B20 Oil Capacity

The BMW M50B20 engine requires 6 quarts of 5W-30 oil with a filter replacement.


What Cars Have A BMW M50B20 Engine?

  • BMW E34 520i
  • BMW E36 320i

M50B20 Engine Problems And Reliability

BMW M50 engine is considered to be one of the most reliable engines of BMW. Listed below are the possible malfunction of the engine, but it is necessary to take into account the proper engine maintenance, because with proper maintenance, the engine will show itself in a good way:

  • Overheating: advice – check the radiator, pump, thermostat, the presence of air pockets in the cooling system and radiator cap;
  • Working with faults: recheck ignition coils, spark plugs and injectors;
  • Floating rpm: possible causes of failure – the failure of the valve or idle throttle position sensor;
  • Coolant leak – cracked expansion tank;
  • Failure of individual ignition coils;
  • Burning of power ignition control keys;
  • Oil leaking at the junction of the oil filter bowl, valve cover gasket, front cover and tray;
  • Lack of the fuel supply;

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The BMW M50 engine was replaced by the BMW M52.

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