Engine BMW M52B20 / M52TUB20 under the hood

Engine BMW M52B20 / M52TUB20

The debut of a member of the new family of inline-six M52 B20 took place in 1994, replacing the popular M50B20 engine. The rookie’s cylinder block is made of aluminum, and the cylinders are coated with a nikasil alloy. Pistons and connecting rods have become different. Along with this, a new intake was used in the BMW M52B20, and the cylinder head was inherited from the M50B20TU. In 1998, a technical update took place, as a result of which the engine acquired a new cylinder head with a twin VANOS on two shafts. In the business center, the connecting rods were changed, the liners became cast iron, the pistons, the cooling system were also updated, the EDZ appeared, and the intake manifold changed the DISA geometry.


Manufacturer Munich Plant
Also called M52
Production years 1994-2001
Cylinder block alloy aluminum
Fuel system injector
Configuration inline
Number of cylinders 6
Valves per cylinder 4
Piston stroke, mm 66
Cylinder bore, mm 80
Compression ratio 11
Displacement, cc 1991
Power output, hp 150/5900 / 150/5900 (TU)
Torque output, Nm / rpm 190/4200 / 190/3500 (TU)
Fuel type 95
Euro standards Euro 2-3
Weight, kg ~165 / ~175 (TU)
Fuel consumption, L/100 km
— city
— highway
— combined
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 0W-30 /0W-40 / 5W-30 / 5W-40
Engine oil capacity, liter 6.5
Oil change interval, km 7000-10000
Normal engine operating temperature, °C ~95
Engine lifespan, km
— official information
— real


Frequent problems

Engine BMW M52B20 / M52TUB20The M52B20 engine is characterized by overheating, which can lead to problems with the cylinder head. If the motor is hot, check the condition of the radiator, it may need cleaning. It also helps to blow through the cooling system to get rid of air pockets. Inspect thermostat, pump and radiator cap.

When oil consumption is high, the condition of the piston rings and cylinder walls is checked. It is often sufficient to replace the rings. If the cylinder walls are worn, a nikasil motor liner is required. Also check KVKG – crankcase ventilation valve.

If there are misfires in the ignition, it is necessary to replace the hydraulic lifters that have become cocked. When the engine rumbles, stalls, rpm floats, and power decreases – check if the Vanos is worn out. Repair is performed using a repair kit.

If the oil light is constantly on, check the condition of the oil cup and oil pump. Crankshaft and camshaft position sensors may fail. Among the problems are a leaking thermostat, an unreliable thread under the cylinder head bolts.

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