My L3301 suggests every 400 hours... which is coming up soon.Speak to me of costs - almost 17 gallons of hydraulic fluid for a change in my M6040. I take all used oil - engine, gear, hydraulic in to the Kubota dealer - the service dept has a waste oil furnace.
By-the-way - Gene, what sort of tractor do you have that recommends hydraulic oil change at 300 hours. My M6040 says every 600 hours.