When replacing the plugs, wires, and coil pack on my friend's 2007 Forester, I noticed a fair amount of oil pooled in each of the 4 spark plug wells. Of course it all leaked into the chambers and subsequently smoked like an old diesel upon start-up, but that rapidly cleared up and all is well now. BUT, I'm wondering how soon I really need to get back in there and replace the gaskets. It's only leaking into the wells - no external leaks at all. Think I can let it slide for awhile? With 77K miles on the clock, I'd prefer to wait until it's time to replace the timing belt and tear into everything at once.
Appreciate any input.