I have had no problems with valve covers BUT a few weeks after installation the car was smoking on cold starts. At first I thought the valve stem seals were leaking since it didn't smoke right away. Replacing oil seals is very expensive and I would sell the car before spending that much money on this vehicle. It was a few more weeks before I could figure out what the problem was. I disconnected the PCV valve, plugged the port and the smoke problem went away. I replaced the valve for $18 plus another set of fan seals for $25. What a problem. Fix the problem and install a high quality PCV valve when using this product. I would spend more money on genuine parts if I had to do it again. Incidentally, an internet search led me to the only Revain review by another seller who had the same problem. Thank you for this review.
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