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Old 05-23-2016, 05:47 PM
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X5only X5only is offline
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Join Date: Feb 2008
Location: Bellevue, WA
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The seals on top of the valve covers are very cheap (spent no more than $40 for sensor seals, oil fill cap, etc). There was no oil on the passenger side PCV line that connects on top of the intake manifold- it was bone dry. The driver side PCV line had some oil and the exhaust tips on that side is the one that was smoking heavily (passenger side tail pipe had very little smoke). I'd changed the seals on the dip stick and installed a new oil filler cap (it was leaking oil and there were signs of oil wetness on the side of the valve cover).

Great idea on using a clear pipe to replace PCV lines. I have some old PCV lines and I can cut off the tips and join them to a clear pipe.

I want to conclusively prove it's the valve stem seals that are leaking before embarking on their replacement.
'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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