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Old 05-19-2016, 06:14 PM
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X5only X5only is offline
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Join Date: Feb 2008
Location: Bellevue, WA
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Both pipes, pcv and pcv surfaces were generally clean ... I got a sinking feeling in the pit of me wallet

I chatted with my indy and asked him how come there's no smoke at startup if the valve stem seals are leaking. He says when the engine is off there's no vacuum, the leak occurs only under high vacuum conditions. Is this explanation plausible?
'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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