I have a Case garden tractor (actually more than one) that also specs multi-weight motor oil, 20w40 but that's not readily available. So most of us use 15w40 or 50. And, they will not work well with hyd fluid. I think there are two things behind that, the light weight is needed for cold startups, otherwise the hydraulics are really slow. The other is the type of hydraulic motor (gerotor) used in mine that needs the thicker body to work well, especially when it gets hot and working heavily. The other thing I suspect, but can't verify, is that motor oil has more anti-foaming additive, due to the crankshaft agitating the oil as it drains back down in an engine. Foaming in a hyd system would be really bad. And the Case uses a fairly small reservoir and the rapid recycling would tend to cause that.
I've bought some of those with normal hyd fluid in them. I got them cheap because the drive was very weak, won't spin tires etc. Fluid change fixes them most times.
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Today's Featured Article - A Farmall Story - by Ed Meadors. The year was 1978. Our young family had recently moved to rural Chesapeake, Virginia to a plot of land which would finally allow us to realize our dreams of a huge garden, critters and more lawn and pasture than we would ever use! We needed a TRACTOR; not a riding mower or tractor wannabe, but a real TRACTOR. The answer to our needs materialized in the form of a '44 Farmall A, complete with cultivators, discs, single plow, a 5ft.Woods belly mower and one, mounted spare 9.00x24 rear wheel.
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