I have a 1980 Pro 60 with Kohler engine. I haven't been able to find user manual, or service manual. The newer ones seem to use 20/50 motor oil in the transmission. Does anyone have a manual. Does anyone have a memory of one. Thanks
That would be conventional oil specs. When synthetic oil is used then many newer hydrostatic transaxles use 15W50. I believe Hydro Gear still specs 20w50.
But as Mark suggest you look-up your model and serial for the operator and parts manuals. Those should have references to what was in your unit.