I am considering purchasing a used BMW M4 and want to know what potential engine problems I should be aware of. Can you provide some insight on this matter?
ReplyAs a BMW technician, I can tell you that the S55 engine in the M4 has had some issues with crank hub failures. This can result in catastrophic engine failure and is not covered under warranty. My recommendation would be to have the crank hub upgraded to a stronger aftermarket one for peace of mind.
I've heard that the M4 has had problems with the electronic wastegate actuator in the turbochargers failing. This can lead to a loss of power and potential damage to the engine if not addressed. It's important to make sure this has been inspected and replaced if necessary when purchasing a used M4.
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