It's not the stock fluid, but others have reported excellent results. Honestly, I'd just buy the two quarts necessary and do it in the driveway as it's not a warranty thing, just routine maintenance, but replacing the fluid with an upgrade. I'm at 20,500 miles and could use to do the same thing (mine still has the stock fluid as well), so this would give me an excuse to buy a new gear lube pump (usually under $10).
Let me know. Probably budget around a half hour per car.
12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB
1995 Mitsubishi Montero SR
1987 Dodge Raider Turbo Project
1986 Mitsubishi Montero 2.4l FI Transplant