Hey everyone from Santa Maria CA! I'm a long time lurker to these forums and finally decided to sign up. I have a 69 bug as my DD and I currently run Amsoil 10w-30 classic car and hot rod oil. I've used this since the engine was new, but I am wondering if there is a safe alternative to the Amsoil. Seems like my engine likes the oil but I have heard that synthetics don't really like the air-cooled motors because they dont dissipate heat as well s Dino oils do. I know many use diesel for the zddp levels they carry, but is the zddp really that necessary for a flat tappet cam motor? Also I have noticed that diesels are reducing their zddp in some oils. Reason why I ask is because I have seen both opinions concerning zddp and flat tappet cams. Thanks everyone again and sorry if beat a dead horse concerning this subject.