Advertisement My dad has a 91 chevy beauville van with a 350. It has 150k mikes on it. It has recently started puking oil from above the oil filter. Here are some pictures. It drips down the fuel filter and also down the pan. It looks as I'd there is a cylinder the oil filter attaches to, and the leak is coming from where that cylinder attaches to the motor. What could be the cause of the leak?