My 2004 terramite recommends 10w30 or 10w40 motor oil only. I read where new terramites call for 15w40 in summer and 10w30 in winter.
I don't want to change my oil 2 times a year.
The hydraulic shop said if you restrict the flow of oil to the hydraulic pump, the oil will overheat.
I recently changed the oil on one of my terramite and used 5w30 synthetic blend from Rural King at $8 a gallon. I'm happy with how the hydraulics work on a cold start and it isn't winter yet.
I think the hydrostat oil used on my JD270 garden tractor is very thin oil.
They hydraulic pump on my old Farmall C was talking on cold winter start ups. I had a bottle of 5w20 full synthetic and that stopped the hydraulic pump from talking in the winter.
If you can't find what the manufacturer recommends, I would go thinner than 80-90 gear lub.
Perhaps stop by a hydraulic repair shop and pick their brains.
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