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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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