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Yes, I found out the hard way when I was changing the PCV Valve about the brittle piping. The plastic they use for the connectors does not last very well and of course to replace some of them is expensive. Again, thanks for the info.

Thanks for the info. I'll try putting a oil additive through it and will get a compression test on all the cylinders. How hard is it to swap and engine in one of these cars? I can buy a used engine with 135k miles on it pretty reasonable.

My Q7 with 3.6L just started smoking and using oil. Replaced valve cover with new PCV valve. Still using oil. Took intake hose off and there was oil in it. Took hose off air box out of PCV but it was not blowing oil. In another forum someone said I could have a cracked head. Could it be...