Picked up another mower! 

Bleachanna what do you mean?

ilike2mow thicker fluid in a hydrostatic will be harder for the worn out pumps to leak internally possibly giving you a little more life out of a worn out transmission. So if you find out what fluid it takes and put something a bit thicker in it it possibly might give you more time with the worn out transmission.

Bleachanna it's a belt drive so it's got a gearbox with gears and grease.