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      09-05-2019, 12:14 PM   #19
MrSweet1991
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Drives: BMW E90 330D M Sport
Join Date: Apr 2017
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Quote:
Originally Posted by Nadir Point View Post
Doing the oil cap test cold upon startup, then again later hot might give a clue. Crankcase pressure will vary more in that comparison, the older it gets.
Upon startup, so leave the cap unscrewed then start the car you mean?