I changed the transmission fluid and filter on my T2290 w/245 hrs. Kubota says to change it at 600 hours. It took 3 qts. of 20W-50 oil. I went with Castrol GTX with the higher zinc content. I had to unbolt the axle from the frame, and lift the mower up away from the axle to access the fill plug. There is no way to get a funnel in there with the frame just above the fill hole. Dumb design on Kubota's part.