The only thing on them for a gasket is a crush washer like the type used for an oil drain plug. If you use the use some sort of liquid gasket on the threads before you reinstall them they won't leak anymore. But as for the need of the cover, I don't understand why cre would get so upset. I don't use mine anymore so I can see if any of the plugs do start to leak again. But the cover does not stop oil or coolant from still getting in the valley and besides there is nothing that the cover covers that is that important. Also what debris is going to get in there anyway unless you are driving offroad with the hood off.
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