Have an 2006 645C with 66,000 California miles on it.
Starting to use a little oil and would like to evaluate the motor.
What is the difference between a compressing test and a leak-down test?
Which may be better for me? Both?
All thoughts and tips welcome!
If you're using a little oil, I can nearly guarantee you that your engine is totally fine, but your valve stem seals are beginning to leak.
ASE and BMW Master Certified Technician
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