Engine BMW N43B20 under the hood

Engine BMW N43B20

The BMW N43B20 engine is a four-cylinder in-line gasoline unit produced by BMW from 2007 to 2011. There are three versions of the N43 engine, which have gained popularity and recognition among motorists around the world. Unlike its predecessor, the N42 engine, the new BMW N43 engine features direct fuel injection and Valvetronic valve lift systems. The engine was produced in conjunction with such units as N45 and N46, however, in terms of demand, it surpassed its followers in this period of time. This engine has been designed to achieve an optimally high level of torque combined with economy and environmental friendliness – a combination that is not always easy to achieve.


Manufacturer BMW Plant Hams Hall
Also called N43
Production years 2007-2011
Cylinder block alloy aluminum
Fuel system injector
Configuration inline
Number of cylinders 4
Valves per cylinder 4
Piston stroke, mm 90
Cylinder bore, mm 84
Compression ratio 12
Displacement, cc 1995
Power output, hp 122/6000
Torque output, Nm / rpm 185/3000
Fuel type 95
Euro standards Euro 4-5
Weight, kg
Fuel consumption, L/100 km (for 320i E90)
— city
— highway
— combined
Oil consumption, gr/1000 km up to 700
Recommended engine oil 5W-30 / 5W-40
Engine oil capacity, liter 4.25
Oil change interval, km 10000
Normal engine operating temperature, °C
Engine lifespan, km
— official information
— real


Frequent problems

  1. Vibrations of the motor housing. This breakdown often manifests itself on the N43 due to the failure of the injectors. Therefore, a complete replacement of the latter will be required.
  2. Trocking and interruptions in engine speed. The cause of the breakdown is the failed ignition coils. Replacement required.
  3. Leaking vacuum pump. Such a disadvantage often appears every 70 thousand km of the distance traveled. The only way to fix the problem is to replace the device.

Engine BMW N43B20The cooling system always needs to be checked, otherwise it is easy to overheat. In addition, the power unit of this series is quite demanding on oil and fuel. Oil requires particularly careful quality control. High-temperature operation of the engine will immediately lead to the deterioration of uncertified oil, which in the future will lead to big problems. Therefore, it is recommended to use only the oil recommended by the manufacturer for N43B20. Proper care and timely maintenance will make the engine run longer than its intended resource.

Leave a Reply

Your email address will not be published. Required fields are marked *