My 1510D took 3 quarts so even if yours uses more because it is a bigger tractor, it probably won't take much more than that. My tractor has a dipstick on the top of the axle. If you are facing the tractor it is on the left side. To drain the old oil I removed the dipstick and there were 3 plugs on the bottom of the axle, one one each side next to the wheel and one in the middle under the front differential. So I would look for your dipstick first so you have a way to check oil level when you refill (plus it helps to let air in as the oil comes out and you will need to put the new oil in there. Mine is yellow if that helps and it unscrews).