Review on Fel Pro 72438 Distributor Mount Gasket by Ken Beasom

This is what you need when you have reason to remove the manifold due to the old black o-ring becoming hard and brittle. In this case, the oil migrates to the distributor cap. In cases where the coil is in the distributor, the bottom contact of the coil will be down and the oil will short out the coil. This causes the car to stumble (at best) or just stall and get you stuck. If your car has driven over 125,000 miles and never changed, it would probably be wise to have someone pull out the distributor to replace it. O-ring and rotor. Clean everything there and check the coil to make sure it's fine.