it's always been my understanding: it is not the hydraulic system that is the issue and requires the GL-1 oil.
It's the yellow metal bushings and bearings in the transmission that you are trying to protect using the mineral oil.
but, since these old tractors are not used hard like they were 50 years ago, you should get by with the car motor oil.
however, as long as I can still buy GL-1 oil for my old 1957 TO-35 tractor, I will use the mineral oil.
The lift still works good and the gears still shift fine in my old tractor.
That oil you bought, Shell rotella 15w40, is great oil, I use it all the time in my dodge diesel truck and also use it in the motor of my old fergy tractor as it still has the zinc additive to protect the valves.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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