I have on in my mustang after 5 years it started leaking. Mine is intercooled. Works great other than that and I don't have to worry about oil from engine to supercharger
There is a mention of mobil 1 5w 30 oil. I only use 10w 40 mobil1 . The 5.0 in the fox body was not a 5w 30 oil engine. Too thin of oil can cause problems. Not sure if that is making any difference for you. Just a thought.