The engine was just rebuilt by a highly respected local rebuilder and I've just got 200 miles on it. But when crawling under it, I see oil drip built up on a number of the oil pan bolt heads and the drain plug. Is this normal? I've tried tightening the bolts, cleaning oil off and it keeps coming back. Do others have this same issue? Solution a little silicone on the heads and run them back thru? I'd like to not end up with a greasy mess engine like before, but is that realistic. I just hate to go to work on things that are a greasy mess.