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Why do you guys use diesel oil? Is it better, cheaper than oil with zink or what?
How do you know it has zink in it?
Are there still engines being built with flat tappets?
The place I worked from 2015 to 2018 we used 15/40 oil in every car or truck that came, no matter it it required 0/20 or roofing tar, they all got 15/40.
Some were older flat tappets cars. Not one ever got a zink additive.
And we never had one come back with worn out cam or lifters.
But I still use either oil with zink in it or the additive in my own stuff and my customer’s flat tappets cars.
Also, does a 6 cylinder Mustang have less valve spring pressure than a V8?
I wouldn’t think so.