dmcschultz
Well-Known Member
Regarding transmission oil you certaintly don't need to use Cat oil. Any SAE30 oil meeting Cat TO-4 specification will work fine. I have no idea if the oil you mention from Tractor Supply meets TO-4 BTW, you'll need to check. Otherwise all the major oil companies make a TO-4 oil. The 21.5 gallons is approximate only, always fill to the dipstick using the conditions on the stick (engine stopped with oil cold or engine at Low Idle with warm oil).
I've done some searching and have found a couple of options, but boy that TO-4 spec oil certainly isn't cheap is it. But then again I suspect a new transmission isn't cheap either.