Since there is no engine info. i will guess at it!! On the rear of the V6 eng. where the distributor used to be there is an O ring that leaks, a lot! 'Again it is a guess'! Cant see it from here. This is the oil pump drive. Whom ever fixes this, use the O ring AND a gasket!!
The gasket is just for an old chevy. dist. can get one at any parts store along with the stock O ring.