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Bevel Gear box oil

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the multi-purpose fluid is recommended by the manufaturer. the "heaviness" of an oil is not important. hyraulic oil used in older trannies & gearboxes is much lighter than 80/90. the question is one of lubrication & colling. i'd go with the manufaturer's recommended fluid

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I bought the Simplicity oil for mine. I still have to get a filter before I change it. I trust the multipurpose oil due to some knowledge of John Deere tractors. When I worked on the farm in high school and early college the John Deere tractors they used were 70's vintage. The hydraulic oil that ran the three point hitch and external hydraulic outlets was the same oil used to lub the complete rearend of the tractor. That's right, the entire rearend, tranny and hydraulics all used the same lot of oil. About 10 gallons if I remember right. So, considering those JD tractors were used very heavily doing much more strenous work as compared to my garden tractor, I have no worries about using the Simplicity multipurpose oil. Just my $0.02.

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