YMMV
GM limited slip additive
Drifting
Joined: Jan 2012
Posts: 1,908
Likes: 129
From: Fredericksburg Virginia
I went to my Chevrolet dealership to buy the gear oil and posi additive.
It was two bottles of gear oil and one little bottle of posi additive.
I went to GM to buy it for the very reason you're asking the question...I wanted to be sure I added the right amount of the stuff.
It was two bottles of gear oil and one little bottle of posi additive.
I went to GM to buy it for the very reason you're asking the question...I wanted to be sure I added the right amount of the stuff.
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
In my experience the oil that already has the additive in it doesn't work. I still had chatter. Only thing that works is the GM additive.
One bottle is what should be needed. GM says a second bottle can be added if chatter persists (this is the official fix for some new Camaros).
One bottle is what should be needed. GM says a second bottle can be added if chatter persists (this is the official fix for some new Camaros).
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
In my experience the oil that already has the additive in it doesn't work. I still had chatter. Only thing that works is the GM additive.
One bottle is what should be needed. GM says a second bottle can be added if chatter persists (this is the official fix for some new Camaros).
One bottle is what should be needed. GM says a second bottle can be added if chatter persists (this is the official fix for some new Camaros).
Pro
Joined: Nov 2014
Posts: 503
Likes: 66
From: Florida
I just changed mine, bought 2 quarts of Valvoline High Performance 80W/90 with limited slip additive already in the bottles, but also added a 4oz bottle of GM limited slip I picked up at the dealer. That was the consensus with most forum users and the dealership. Most dealerships around here no longer carry the original part number product gear oil and said just use any good 80W/90, but also recommended Valvoline. plus it is a lot less expensive. 
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