I have a 1988 Bronco II, it actually belongs to my 15 year old daughter. I had the engine sealed. Even after sealing the engine, I have a small leak, at the oil filter adapter. I do not know the Ford 2.9 L six cylinder engine. The leak is a combination of the bolt, for the adapter and the seal for the bolt. Parts do not exist or I can't find them. What can I do to stop the oil leak?