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Thread: engine testing

  1. 08-01-2017, 06:33 PM #1
    bukzin
    bukzin is offline Member
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    2005 645Ci convertible

    engine testing

    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!
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  2. 08-04-2017, 03:54 PM #2
    White94RX
    White94RX is offline Member
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    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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