Quote:
Originally Posted by jbond007
1) Had the same thing happening on my 4.8is. There are CCV valves that can get sludged up. With enough sludge build up, it can stick and cause a vacuum. It sucks up your oil and it gets dumped into your intake manifold while you're idling. You may notice you are burning more oil than normal too. Your engine is fine, it's just the CCV valves.
2) My mechanic says he sees in addition that the valve covers get sludged up over time and cause the same issue since it's part of the same system. The interior of the valve cover has a "labyrinth" of passageways to separate the oil from the air and allow the crankcase to ventilate. Those passages can get clogged to the point that it creates the same oil vacuum affect. Since the valve covers are ~$400 a pop, I started with the CCV valves and put an additive package for sludge removal in my oil.
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I have an '06 4.8iS with 72k and it started doing the smoke show at idle. I first noticed it when it was being driven out of the car wash and having to sit an idle for about 2 minutes. I was shocked at the plum of smoke.
I figured it was CCV when I first saw it but after reading some of these threads I am now freaked out. I really hope it's my CCV's and not the valve stem seals.
I love my X5 and hope it gives me several more years of non issues as it has the last 72k.
Beside replacing the CCV's should I replace anything else corresponding?
Thanks,