I bet they are leaking oil because being an older vehicle the gaskets have shrunk. Try this. Add but don't overfill your crankcase with up to a quart of "Marvel Mystery Oil". You can get a bottle at WalMart or at an auto parts store for four dollars. I used it on an old neglected engine that leaked like a sieve and it stopped all the leaks like magic. MMO has been on the marked nearly a century because it really works. But if your engine is all sludged up, be careful you don't clog your oil pump screen by using too much too fast because it also cleans and quiets engines fast. I hope this helps.
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