Posted by sotxbill on June 04, 2021 at 14:40:59 from (104.5.24.112):
In Reply to: 303 oil posted by Gene Davis (Ga.) on June 03, 2021 at 10:30:18:
maybe....,,,
303 oils were superseded when higher pressures and flow rates required in neweer model tractors... generated more heat. SO in most tractor hydraulics after 1976-80, they no longer were suitable AND>>>> the key viscosity additive was whale oil which became banned by an international treaty... so overnite these fluids fell out of favor and newer mineral oils with modern viscosity improvers... had to be specified. 303 fluids could be run in applications where there were wet brakes and wet clutches and were very close to "type F" auto transmission fluids.
so yes as a basic hydraulic only fluid, it would probably work fine.
There are a lot of pre 80s backhoes/tractors out there still using it.
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