BMW M52B25 Engine Specs, Problems And Reliability

Like the previous 2-liter engine, this BMW M52B25 engine is also based on the M50 engine, but unlike its predecessor, it has less horsepower (22 hp less). Produced from 1995 to 2003. M52B25 in 1998 was recognized as the best engine in the United States and established on

Produced from 1995 to 2003. In 1998 the M52B25 engine was nominated as the best engine in the United States.

In 2000, the engine began to be gradually replaced by a new 2.5-liter six-cylinder M54B25, and a year later M52B25 motor release stopped.

M52B25 Engine Specs

Manufacturer  Munich Plant
Also called BMW M52
Production 1995-2001
Cylinder block alloy Nikasil-coated aluminum
Configuration Straight-6
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 75 (2.95)
Cylinder bore, mm (inch) 84 (3.3)
Compression ratio 10.5
Displacement 2494 cc (152.2 cu in)
Power output 125 kW (170 HP) at 5,500 rpm
125 kW (170 HP) at 5,500 rpm (TU)
Torque output 245 Nm (181 lb·ft) at 3,950 rpm
245 Nm (181 lb·ft) at 3,500 rpm (TU)
Redline 6,500 rpm
HP per liter 68.2
Fuel type Gasoline
ECU Siemens MS41.0
Siemens MS42.0 (TU)
Weight, kg (lbs) ~165 (364)
~175 (386)
Fuel consumption, L/100 km (mpg)
for E36 323i
13 (18.1)
6.7 (35.1)
9 (26.1)
Turbocharger   Naturally aspirated
Oil consumption, L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil 0W-30, 0W-40, 5W-30, 5W-40, 10W-40
Engine Oil Capacity, L (qt.) 6.5 (6.9)
Oil change interval, km (miles) 7,000-10,000
Normal engine operating temperature, °C (F) ~95 (203)
Engine lifespan, km (miles)
-Official information

~250 (155)
Tuning, HP
-Max HP
-No life span loss

BMW M25B25 Engine Oil Capacity

The BMW M25B25 engine requires 6.9 quarts of 0W-30 oil with a filter replacement.

What Cars Have A BMW M25B25?

  • BMW 323i E36
  • BMW 523i E39
  • BMW Z3 2.3 Roadster

BMW M52TUB25 Review

The BMW M52TUB25 engine appeared in 1999. It is an upgraded version of the BMW M52B25 engine. Cylinder capacity remained unchanged at 2.5 liters (2494 cu. Cm).

His camshafts received a double  VANOS valve timing system. Now torque peak has shifted to 450 rpm below.

Engine power is 168 hp at 5500 rpm and torque of 245 Nm at 3500 rpm.

What Cars Have A BMW M52TUB25?

  • BMW 323i  E46
  • BMW 523i  E39
  • BMW E36 / 7 Z3

BMW M52B25 Engine Problems

  • Radiator & expansion tank leaks
  • Water pump failure
  • Rough idle from idle control valve
    Valve cover cracks & oil leak
  • Dual-Vanos failure

In general, the engine’s internals are unbreakable. You should easily exceed the 200k mile milestone without having to replace any valves, chains, rods, cranks, or seals. While the engine and its components may be tortured to death, the supporting engine systems are more likely to give you trouble. The cooling system is susceptible to failure, including the water pump, radiator, expansion tank, and other components.

These engines are fantastic, and the internals will last you a long time. However, as the car grows older and becomes old, maintenance becomes more important, and supporting engine components will naturally wear out from use and tear. I’m sure you’re familiar with this if you own one of these cars. If you’re considering purchasing one, prepare to invest a lot of time on maintenance and save money in the bank for major repairs.

More typical problems of this engine are listed here.

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The information provided in this article is for general informational purposes only. The author and publisher make no representations or warranties of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability, or completeness of any information presented. The reader is advised to consult a qualified professional, such as a mechanic or dealership, before making any decisions related to their vehicle's engine oil or maintenance.

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