Did you open up the holder and see if an actual FT was inside? The older ones look like a coil of tin foil and the later ones look like tiny spagetti strainers. There is also a vacuum line to the FT holder. The other guys will correct me if I'm wrong but think the turbos have the holder w/o the actual FT inside. When they plug up on non turbo engines, crankcase pressure rises and you often get oil leaks at various engine seals.