Quote:
Originally posted by Steve@Rennsport
Worn rings will do the same things as high cylinder vacuum pulls oil past the oil control rings.
The best thing to do is have a leakdown test performed to pinpoint the source of any compression loss. This will help pinpoint the source of oil consumption.
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I had compression test done last year, all cylinders were 10bar (not sure what that is in psi but they were all the same value which is the important thing right).
I had a leakdown test done this year, which was far worse:
7%, 12%, 24, 26, 28 and 30%.
But I only started really noticing the tailpipe smoke appear after I had 2 new valve covers installed (both sides leaked).
Is it possible to get such different results from compression vs leakdown test?
Could valve cover replacement have anything to do with it?
Oh and this: the car had only done about 4000 miles in 10 years when I bought it last year. Since it has done about 1500 miles. And when I got it it was running way too rich (black smoke on hard acceleration). That's all the facts.