Engine BMW N55B30 under the hood

Engine BMW N55B30

In 2009, to replace two brands of engines, BMW released a fresh generation of N55B30 engines. The new engine had an aluminum cylinder block similar to the N54. The cylinder block had cast iron liners and oil nozzles, a crankshaft weighing 3 kg, modified pistons with connecting rods. The connecting rods were now 144.35 mm long. The cylinder head was changed, the variable valve timing system on the two Bi-VANOS shafts was improved.


Manufacturer Munich Plant
Also called N55
Production years 2009
Cylinder block alloy aluminum
Fuel system injector
Configuration inline
Number of cylinders 6
Valves per cylinder 4
Piston stroke, mm 89.6
Cylinder bore, mm 84
Compression ratio 10.2
Displacement, cc 2979
Power output, hp 306/5800-6000
Torque output, Nm / rpm 400/1200-5000
Fuel type 95
Euro standards Euro 5
Weight, kg 135
Fuel consumption, L/100 km (for F30 335i)
— city
— highway
— combined
Oil consumption, gr/1000 km up to 700
Recommended engine oil 5W-30 / 5W-40
Engine oil capacity, liter 6.5
Oil change interval, km 10000
Normal engine operating temperature, °C ~110
Engine lifespan, km
— official information
— real

Frequent problems

  1. Increased oil consumption. On N55 series engines, failed crankcase ventilation valves are responsible for this problem.
  2. Periodic ignition damping. Breakage is usually caused by carbon build-up in hydraulic lifters. After checking and adjusting, it is necessary to make it a rule to check the quality of the filled oil.
  3. Motor shaking. Most likely the problem lies in the malfunction of the injectors. The period of their operation does not exceed 100 thousand km of run. Therefore, it is necessary to diagnose them and, if wear is detected, replace them with new ones.

Engine BMW N55B30
Units of this series are not protected from the traditional problem associated with the high pressure fuel pump – periodic complete breakdowns. Prevention consists in the choice of exclusively high-quality fuels and lubricants.

Despite all the problems, the overall engine is good, reliable and strong. Differs in a normal resource reserve, is often bought for tuning.

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