Basic terms, Many years ago gas and oil had different additives and engines depended on these additives to reduce wear. Materials, gas and oil changed. New gas and oil is ok for newer engines but the older engines still need these additives.
Don’t use the high zinc oil in a vehicle with a catalytic converter for more than just a break-in period or you will have problems. But it’s very good for older engines long term.
Zinc in oil and leaded gas both aided lubrication and reduced wear
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