I've jacked up the car,looked underneath,looked everywhere I can for this pesky leak and still no joy.The leak seems to be below/around the oil filter(already changed it),nearest the water pump and the belts.Anyone ever have a similar problem?I've checked the oil pan and oil sending unit and it isn't those items either.

1984 Buick Skylark,2.5L,Engine "R" Code

Thanks!