I've got a pair of ebay catch cans that aren't quite sealed perfectly. I know, I get what I pay for. So should I use silicon gasket, teflon tape, or something else? I don't think there's much heat, but what will hold up to oil and such.
I'm not sure what's best, but don't use regular teflon tape where it will contact oil. Use the yellow stuff they sell for use in gas (natural gas) pipes instead.