i decided to change my front axel fluid at 100 hours on my MX4800. The manual isn't very detailed on how to do it but i still followed it what it said. the capacity its 8.9 quarts, i have 9 quarts on hand and didn't even use half. i started to fill it and it started to leak out of the "full hole" pretty quick, i jacked it up and tipped the axel so it would fill in both side, but i still have about 5 quarts left and most of it drained out. i did remove both drain plugs. does the front axel hold a bunch of fluid in the center of the axel? even though both plugs get removed? i had to let a bunch drain out of the full hole because i did filled it to the hole where you fill the fluid. so i let it drain until it wasn't flowing out of the hole. is it common for them to still hold the older fluid?