Would using 15w40 Chevron Delo with STP additive contain enough zinc to safely operate with a flat tappet Comp cam? I am currently running Valvoline VR1 20w50, which has lots of zinc, but want to run a thinner oil to pick up some power and fuel mileage.

2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!