I have been thinking about this for a while now. If zinc is important to engine with flat rappers ten why are there not more issues with car on the road. Not "modern" cars but roller rockers were not standard in a lot of cars. Yet they still function fine. I used regular 10w 30 in both my Camaro and mustang without issue and both are flat tappet engines.
52 Chevy 1/2 ton - work in progress 65 Mustang coupe - work not in progress  67 Mustang GT convertibile 67 Camaro RS/SS We are now even with fords and chevys. Now i need a mopar. Hahahahahahahahaha
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