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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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