Originally Posted by hoffmanestates
I purchased oem valve cover gaskets and they still leak
If there is a clogged PCV valve or excess blowby causing excess pressure in your engine in can cause even the best valve cover gasket to leak.
It's similar to replacing a fuse that blew with a new one and then complaining about a defective fuse when the new one blows, when the problem was never the fuse to begin with.
After having this problem with your valve cover gaskets leaking multiple times in quick order, you may want to check to make sure that there isn't another problem causing your symptoms.