just about every engine builder i know uses standard synthetic or dino otc oils.
no one uses exotic brands like schaffers or amsoil because they say their snake oils.
but everyone of them says redline is good stuff, and use it in hipo applications. (royal purple to a limited extent too)
if amsoil or schaffers were indeed as good as they say, why doesnt hardly anyone use them? why do no body even know what schaffers is?
to me it would seem that engine builders see what goes into an engine and what engines break using what oils, hence tha fact that NO ONE uses frams.
this isnt to say amsoil or schaffers are bad, they are most certainly not bad plenty of uoa's to prove that. but why is it that no one uses them i know of?
when it comes down to it and i walk the lot at moroso drag strip, i see no amsoil or schaffers bottles. (i see no frams either which must mean atleast most racers are partly informed about lubrication)