What is the difference between the M40 and the M42 engine?
Compared with the M40, the M42 features a DOHC valvetrain, a timing chain, hydraulic valve lifters and an increased 10. Later versions of the M42 also feature a dual length intake manifold (DISA). The BMW M40 is an SOHC straight-four petrol engine which was produced from 1987–1994. It served as BMW’s base model four-cylinder engine and was produced alongside the higher performance BMW M42 DOHC four-cylinder engine from 1989 onwards.When it comes to performance, both the M4 and M5 deliver a stirring driving experience. The new BMW M4 is powered by a 3. Meanwhile, the M5’s centerpiece is a monstrous 4. V8 supplemented by an electric motor, good for 717 horsepower.
Is the M40d engine reliable?
The six cylinder diesel engine in the M40d is also pretty reliable, but we have come across issues with coolant and oil loss, failing gaskets and VANOS solenoid failure. Our owner survey revealed many satisfied users of this ‘G01’-series X3 model, but inevitably, there were a few issues reported. The six cylinder diesel engine in the M40d is also pretty reliable, but we have come across issues with coolant and oil loss, failing gaskets and VANOS solenoid failure.