Engine BMW M50B25 / M50B25TU

Engine BMW M50B25 / M50B25TU

In 1990, the inline 6-cylinder M20V25 engine from BMW was replaced by a new, much more powerful and advanced M50V25 (popular name – “plate”). The unit belongs to the new M50 family, the same line includes M50B20, M50B24, S50B30, S50B32. The main difference between M50 and M20 engines is the cylinder head. In the new engine, the cylinder head is already two-shaft, has hydraulic lifters, the number of valves is 24. The gas distribution mechanism in the M50 engines is now driven by a chain. According to the manufacturer, it serves about 250 thousand km, most often longer.


Manufacturer Munich Plant
Also called M50
Production years 1990-1996
Cylinder block alloy cast iron
Fuel system injector
Configuration inline
Number of cylinders 6
Valves per cylinder 4
Piston stroke, mm 75
Cylinder bore, mm 84
Compression ratio 10.0
10.5 (TU)
Displacement, cc 2494
Power output, hp 192/5900
192/5900 (TU)
Torque output, Nm / rpm 245/4700
245/4200 (TU)
Fuel type 95
Euro standards Euro 1
Weight, kg ~198
Fuel consumption, L/100 km (for E36 325i)
— city
— highway
— combined
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 5W-30 / 5W-40 / 10W-40 / 15W-40
Engine oil capacity, liter 5.75
Oil change interval, km 7000-10000
Normal engine operating temperature, °C ~90
Engine lifespan, km
— official information
— real


Frequent problems

Engine BMW M50B25 / M50B25TU under the hood

  1. Overheating. The M50 unit is characterized by an increase in operating temperature. If overheating is detected, it is necessary to diagnose the radiator as soon as possible (for the formation of air locks) and its cover, thermostat and pump.
  2. Troenie. Inspect the ignition module, injector and spark plugs.
  3. The turnovers are jumping. The problem is a broken or dirty idle valve. The reason may be hidden in the throttle sensor, temperature sensor and lambda probe.
  4. M50 Vanos. Signs – rattling, reduced power, jumping rpm. The solution to the problem is to buy a vanos repair kit.

Also, M50 engines consume almost 1 liter of oil for every thousand km. Sump gaskets and valve cover gaskets, oil dipstick may start to leak. The expansion tank will often crack. Problems are also created by the camshaft and crankshaft sensors, coolant temperature. Most of the disadvantages of the engine are due to age and the nature of operation. However, with proper operation and reasonable maintenance, its resource can be far beyond 400 thousand km. Most often it is purchased for the subsequent swap.

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