Just did mine with all Mobil-1 and it's super easy. Instructions are actually in the owner's manual which shows all the drain and fill points for each component. The hardest part is getting fluid back into the diffs/tranny/xfer since you can't just pour from the top. I ended up using a piece of Tygon hose on a container I could pressurize with air to force the fluid right where it needed to go. Fills take just a couple minutes! I did see a pump at Wal-Mart (about $8) that would do the job too. Looks kinda like a big pump on soft-soap but fits right on top of the gear-oil container and pumps it through a section of hose that's included. When you're done with the diffs just use one of the gear-oil containers for the tranny fluid and pump away. Help this helps!