Quote:
Originally Posted by dmsfrr
I'm on the Zinc side of the fence.
I was using an older Rotella 10/40 oil but switched to Valvoline VR1 Racing/High Zinc 20/50
High performance formula for flat tappet engines
" am I looking for trouble"
Valve train wear may or may not take a while. How many miles do you drive it a year? Some off-shore sourced parts (valve adjusting screws) can fail in a few weeks no matter which oil is used.
50's, 60's & some 70's motor oil used to contain zinc (& phosphorus) to help reduce wear at the high stress pressure points in the valve trains of older engines. But with the advent of unleaded fuel, catalytic converters, hydraulic and roller lifters... the zinc & phosphorus wasn't as needed and it contaminated emission equipment... so it was removed.
I think of high Zinc oil as insurance. Might never need it or know that I did, but I don't want the cam to go flat either.
More info at this link... https://www.ctci.org/engine-oil/
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I am with you on this. I use Valvoline VR1 also in my avatar 302. One oil change a year won't break the bank!!