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#1
04-10-2006, 04:55 PM
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Royal Purple
I have a 1999 Tahoe, with the G80 rear end (limited slip). I am planning on changing the front and rear diffs to royal purple's max gear oil. I was wondering if i still needed to add the limited slip additive to the rear end with royal purple? from my limited research, i don't think so but i'd like to know for sure. Also, it calls for an 80w-90 oil, but all i could find in royal purple was 75w-90, is this ok? thanks in advance.
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#2
04-10-2006, 05:23 PM
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Re: Royal Purple
No you don't have to add the additive to your diff, it says right on the bottle that it contains the limited slip additive.
__________________
NO 4 N JUNK  1994 GMC K1500 XC 5.7L 2008 Chevy Impala LTZ
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#3
04-11-2006, 07:09 PM
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Re: Royal Purple
Ok thanks... it helps to read the bottle before asking dumb questions. By the way, what kind of benefits should i expect to see with royal purple in the front and rear diffs?
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#4
04-11-2006, 07:43 PM
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Re: Royal Purple
I bought a used car back in 2002 that had a G80 diff. I changed the fluid and used Mobil 1 Synthetic Gear Oil that said it contained the limited slip additive. Within a few days, I noticed a groan coming from the diff when ever backing out of a parking spot or making a tight forward turn. I found some posts on another forum that GM G80 diffs prefered the GM additive over others. I dumped a bottle of the GM lube into the diff and the groan went away.
On the other hand, I did the same thing for my 2000 Yukon with G80 (before I bought the car) and it did fine with the Mobil 1 without the GM additive. If you notice any noise coming from the rear, you may want to try a little GM additive. //2000CAYukon
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