I agree! I have the redline 75w-90. One sniff of differential fluid and you might lose your appetite for a week! I know I did..I couldn't eat my fried chicken my family bought that day

 

Damn, was gonna try and tackle this on Sat until you guys brought the smell into it... lol

 

Haha. Yeah that stuff is really rancid smelling. It's a messy job, too.

 

How's "Royal Purple" 75w-90 sound? I bought 1 quart and need another. Anyone use this before?

 

That should work fine

 

I originally replaced factory fill with Mobil1 around 60k miles. I will be replacing it with RP this summer. my odo now reads just shy of 115k miles. I have heard nothing but good things about RP gear oil both here and on BITOG.

 

Thanks. I can't say that my fluid has ever been changed and it's at 155k. I can imagine that my car will be much happier

 

I'm doing mine either this weekend or next. I got 125K on my '99 GS4. I've got soo many DIY jobs to do in the next few weeks. I just got my new ball joints and tie rods from Sewell so I got those to do. I am getting my Timing belt and waterpump replaced this weekend - not comfortable enough to do THAT myself - and my rear bumper repainted. I'm changing my front rotors and pads - probably while I do the joints and rods. Whew! I will be posting DIY pics and instructions for whatever I can.

 

Does anyone know how much fluid the rear diff holds? I guess my real question is......how many drain & fills does it take to get most of the old fluid out?

Also, if I can't get my hands on Redline, would Mobil1 75w-90 oil be ok? http://www.mobiloil.com/USA-English/..._75W-90LS.aspx

 

1.5 quarts

 

yes, Mobil1 will work beautifully...

one drain and fill - none stays in the diff housing when drained... (though I like to pour a little fresh in while the drain plug is still out to wash out the bottom)

 

I was at the local AutoZone & Strauss. Royal Purple? Redline? The guy looked at me like I was an alien.

But luckily they had Mobil1 75W-90. Grabbed the last 2 bottles! I give up finding these "premium" oil. I'll get what I can. I'm tired of hunting.

 

Hope this helps: http://www.royalpurple.com/dealers/dealers.html

 

Thanks for the link. But I did manage to find Mobil1 that day. Thx again.

 

I have used Mobil 1 synthetic oils for all my cars and they always perform perfectly.
I would love to use Royal Purple and Redline but the price and availablity is what keeps me using Mobil 1. I love going to any store and picking up what I need when I need it!