Onced again Kubota is saying one thing in their manuals and selling something else. On their website and in my manual says use GL-4 gear lube for the front axle case and differential on my M7040 but when I was at my dealer getting the fluids for its first change the Kubota gear lube said GL-5 on the bottle. I would guess its OK to use Kubota gear lube in a Kubota tractor but you would think they really would try to get on the same page with this stuff and not say one thing and sell another.... I guess I'll use the super UDT2 in the front axle case to be on the safe side.....