santafepa, the 490e uses API GL-5 gear oil, temps 20-122 can use SAE 140, temps 14-122 can use SAE 90, SAE 85-140, so there is a good spread lube wise. Also my 490e operator's manual does not show it, it's left out of my book, has a page # but not in it, does reff pump gear box oil, does not give the amount or service change hrs. Hope this helps!.