BMW Questions? Ask a BMW Repair Expert for Answers.
Hello, my name is***** you for the question. Can you tell me if the oil was changed recently? Is the check engine light coming on? Does it smoke more when you accelerate?
It may be an issue with the PCV system, or an internal engine failure. It is common for the engine to fail internally and cause this. Has the PCV breather and hoses been checked?
Hopefully that is all that it is. That should only be a couple hundred dollars to repair. It would obviously be much better than an engine failure.