What changed with CK-4 oil?

[Brock]

Contrary to what rawze said, I did get noticeable gains when switching from 15w40 Dino to a 5w30 synthetic but maybe it's due to the heavy weights I haul. That being said, I still took out my cam so not worth the gains.

I know years ago a few guys up here played with the idea. One guy ran a straight 50w oil and never shut his truck off during cold months. Changed oil every 300 hours, all the other guys made fun of him but his motor far outlasted everyone else's.