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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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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