My daughter has 1995 Chevy Lumina with a 425 engine (?) that leaks oil. The intake valve has been replaced and it still leaks oil. The mechanic says he can't place the origin of the leak because the engine is shaped like a V and the oil pools at the bottom then leaks out all over. How can the oil leak be diagnosed properly on this engine?

I had a '93 Chevy Lumina (sedan) with the 3.1L V6, and it was also leaking oil badly enough to coat the underside of the car with an oily sheen. A mechanic pointed me in the right direction. There is no distributor on this car, but there is a blank-off plate installed where the distributor used to be. The oil pump drive shaft runs off a gear meshed with the cam under this plate, which is also what the distributor used to be driven from. All I had to do was remove the plate, replace the gasket fitted between the plate and the opening, and oil could no longer seep through there. As I remember, I had to remove the air horn from the intake plenum to get at this plate. Hope this helps.