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 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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