I think this has been asked before, but I am still not sure I understand the answer.
What
oil should be used in the
Kanzaki KM4A
gearbox used by many
Yanmar engines?
The data plate say "20/30 HD". Which means what? Monograde either 20W or 30W? Or 20W-30 multigrade? Which I don't think I've ever seen.
I think I have always used the same
oil as I use in the
engine -- 15W-40. But maybe this is not right. I have had some very slight problems with the
gearbox slipping after extended running at very low
RPM.
Grateful for all tips.