I don't even bother with the higher octane now. I never had an engine
get into trouble with the new fuel and I don't know anyone who did.


Some of the high performance engines of the era, the big Ford V8 was one, had
poppet valves that rotated slighly with each movement. Touted as a self
grinding effect. I knew of several of those that went down with Sunoco
Sunlight. Never had any effect on heavy engines like old tractors and Briggs
type engines.