I changed the rear diff fluid today. After 64000 miles, it was pretty nasty. Refilled with Mobil 1 70w90LS. I also replaced my diff cover since it was getting pretty crappy-looking---EVH stripe-job pics below. It took about 2-1/2 quarts to fill. Anybody who's thinking of doing this, do yourself a HUGE favor and buy one of the hand pumps that screws onto the quart bottles-I picked mine up at Advance when I got the gear lube. It was like 7 bucks and worth every penny.
You know you're a Van Halen fan when you do this:
Probably not for everybody, but I really like how it turned out.
Play Fast. Wear Stripes.