Recommended differential oil
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
For the C6 diff, I recommend:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (product code SVQQT - you'll need 2 quarts)
AMSOIL Slip-Lock Differential Additive (product code ADABA - 1 bottle)
Although I use this fluid in both my 02 Z06 track car and my 06 CTS-V daily driver without extra additive and neither diff chatters, the C6 diff seems to need one bottle of the additive.
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (product code SVQQT - you'll need 2 quarts)
AMSOIL Slip-Lock Differential Additive (product code ADABA - 1 bottle)
Although I use this fluid in both my 02 Z06 track car and my 06 CTS-V daily driver without extra additive and neither diff chatters, the C6 diff seems to need one bottle of the additive.
Been using it for close to 3 years without issue. My engine, trans, and dif all use Amsoil.
Intermediate
Joined: Dec 2009
Posts: 32
Likes: 0
From: San Diego California
Help!! still making noise
I had a lot of rear end noise so i had the differential fluid changed and i used the Dextron fluid from chevy. After doing a couple of figure 8s the noise had quieted down by like 75% but now it is back?
(it has been approximately one week since the change) should i add a tube of the Amsoil additive or could it be something else?
(it has been approximately one week since the change) should i add a tube of the Amsoil additive or could it be something else?
Race Director
Joined: Sep 2000
Posts: 11,143
Likes: 1,913
From: Missouri City, TX
I had a lot of rear end noise so i had the differential fluid changed and i used the Dextron fluid from chevy. After doing a couple of figure 8s the noise had quieted down by like 75% but now it is back?(it has been approximately one week since the change) should i add a tube of the Amsoil additive or could it be something else?
(it has been approximately one week since the change) should i add a tube of the Amsoil additive or could it be something else?
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
I assume that you used the new DEXRON LS fluid and did not add any additive separately. If that is the case, I would next go ahead and add 4 ozs of either the GM slip lock additive or the AMSOIL additive (which ever is easiest for you to obtain). Don't add more additive if you have already added a separate bottle. Add and do more figure 8s. I would give it a few weeks of DD before deciding success or not. If not successful, I would next do another fluid change with AMSOIL Severe Gear 75W90 and add a 4 oz bottle of their slip lock additive. I feel sure the AMSOIL will do the trick for you as it did for me over 30 months ago after my Z was chattering very badly even after a dealer fluid change with the old Goodwrench fluid. JMHO.
Race Director
Joined: Sep 2000
Posts: 11,143
Likes: 1,913
From: Missouri City, TX
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Basically all fluids they use are Amsoil even the brake fluid but for some reason they use the GM additive because it is quieter.
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Instructor
Joined: Dec 2008
Posts: 152
Likes: 2
So are you using/recommending the "standard" Redline 75W90 and additional friction modifier (doesn't it already include the friction modifier?)? How much modifier is required? A full bottle? Or do you mean 75W90NS plus friction modifier?
Last edited by Yasei; May 17, 2010 at 03:14 PM.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
My only experience in using Redline is that it doesn't require any additional modifiers and it saved me from selling my other car with 5 spd. transmission. After the MTL Redline was put in the shifts were so smooth very easy engagement in gear box.
Instructor
Joined: Dec 2008
Posts: 152
Likes: 2
Looking at LG Motorsports "C6 Power Pack" which has all the fluids in one package and the set includes the friction modifier:
http://www.lgmotorsports.com/catalog...oducts_id=1635
That just made me wonder if it's needed and how much (if all)... The diff fluid bottle and description say 75W90 (not 75W90NS).
http://www.lgmotorsports.com/catalog...oducts_id=1635
That just made me wonder if it's needed and how much (if all)... The diff fluid bottle and description say 75W90 (not 75W90NS).
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