I changed my own, I only did it once, but I didn't need any special tools..you need to drain from the front axle ,which was the hard part,I ended up raising the front of the machine and disconnecting the oil feed line where it threads in to the front hydraulic filter, I then removed the small bracket for the weight transfer chain and was able to let it all drain into a pan,I changed the filters while it drained and make sure you fill the front one with fresh fluid being extremely careful not to get anything in it,because that would be pulled into the main hydraulic pump without filtering on startup....the rear filter works under pressure not suction, so no need to fill it,its just a case drain filter.The rear axle has its own fluid separate from the main hydraulic system. You can see the drain and fill for it.I personally use SAE30 with about 10 percent Bestline power train additive in it..I use Amsoil 5w30 hydraulic oil in the main system with a quart of best line powertrain additive..that stuff is amazing, quiets down the hydraulic system and improves the feel and smooth operation of the entire system. One other thing if you have the turbodiesel engine make sure you fill the oil very slowly after an oil change, or disconnect the breather from the valve cover when filling either one works...