I have a friend with a 2002 Ram 1500, 4.7L gasoline. He has a white "scum" or heavy film in the oil filler tube and a gasoline smell in the tube/cap. Truck runs/idles fine and does not have signs of any smoke. No oil loss between changes @ 3,000 mi. Radiator fluid seaps low, in time, but none is found outside of the engine. Is it possible a PVC valve gone bad not allowing condensation to leave the engine? How would gasoline smell get in the cap/tube? My first guess is blown head gasket but there are no bubbles in the oil on the dip stick.
This question is above my grade!