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Originally Posted by big bubba
Am going on my 3rd change of ft axle/ diff. oil on Kubota (7040) have residual of 2 different brands of GL5. okay to mix those for change, or stick w/one name brand? thanks in advance bb
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The specification that control the GL series should fully cover "mixing." I would not worry, done hundreds of times daily.
For what it is worth, I did a lot of research on GL5 and GL4 as I am restoring a '63 Supercharged Studebaker Avanti. There is some controversy on if the "copper compatible" GL5 can be used in (manual) transmissions. GL4 is formulated for the "yellow" metals in transmissions and other similar applications. Some GL5 brands "claim" to be "compatible" with "yellow metals." ...and GL4 is tough to get. I finally decided to error on conservatism and got "explicit" GL4 and GL5 and will use each in the explicit application. I bought the GL4 mail order at roughly the same cost I would have expected to find it in the local auto/tractor store.