I don't know anything about combustion theory and I only own one tractor, a 1966 140 that my old man bought when I was 14. When they got rid of the lead, she started to knock, but only when bushhogging thick grass uphill on a hot day. I hate knock--and after giving up on lead additives (made no difference), I switched up to Premium, no knock. She will bog down, but she won't knock. Mid-range or Plus, also no knock. So I have stuck with Plus for the past twenty years. Just one man's experience with one tractor. I have always gone by the rule that the lowest grade that doesn't knock is what you need, any more is wasteful. I guess turbos are different, but I don't own any.
This post was edited by TheDurk at 13:37:47 03/06/09.
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