SAE 90W "pure mineral" transmission oil is usually the same thing as 30W engine oil with no additives. But I guess we never know for sure unless we read the data sheets. Even then some info is kept "proprietary."
Trans viscosity numbers are different then engine oil viscosity numbers. Trans 80W-90W is basically the same as engine 30W-40W.
Tractor supply sells the 90W trans oil as "Ford transmission" pure mineral oil. Also has non-degergent 30W engine oil but who knows what is, or isn't in it.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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