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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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