gmc, im agreeing with you.maybe all oils that are high in zinc and phos. keep "slippery" when contaminated...dunno...i was trying to make the point that the reason i use brad penn is cause when im using nitrous my oil smells like fuel, but it remains "slippery"
i didnt mean to pick at a nerve,sorry if i was unclear of why motors that are subjected to contaminents (fuel) would appreciate brad penn oil.if it stays "slippery" when contaminated because of the zinc and phos., then i learned somethin new....
just with roller cam motors dont need the zinc and phos. to the same level like flat tappet cams do. i know the additives also help other valvetrain along with all moving parts in friction.im sure u know this again,but others might not