All my fluids are RP
Differential Fluid, which do you use?
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,888
Likes: 21
From: Olathe, Kansas
Differential Fluid, which do you use?
I'm about to change my differential fluid and would like to hear your recommendations for which fluid and/or additive you prefer.
I've researched this to death, and there are so many differrent opinions, it's very confusing! Are you using the GM fluid with the full 4oz of GM additive? Redline or Amsoil without additive? Mobil 1 with additive? Any help would be greatly appreciated!
I've researched this to death, and there are so many differrent opinions, it's very confusing! Are you using the GM fluid with the full 4oz of GM additive? Redline or Amsoil without additive? Mobil 1 with additive? Any help would be greatly appreciated!
Le Mans Master
Joined: Aug 2002
Posts: 8,222
Likes: 0
From: Norfolk VA
Mobil 1, Redline, Royal Purple, and Amsoil are all top quality products and you'll be fine with any of them. I have Royal Purple in my Trans and Diff. only because it is sold at AAFES and that was the only synthetic trans fluid I could get locally.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
Mobil 1 synthetic 75W90 + GM additive.
Put the full 4 oz additive in first
Why?
I believe in deep pockets... Exxon Mobil has much deeper pockets than Amsoil or Royal Purple.
The can't afford to market an inferior product.
Put the full 4 oz additive in first
Why?
I believe in deep pockets... Exxon Mobil has much deeper pockets than Amsoil or Royal Purple.
The can't afford to market an inferior product.
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Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Originally Posted by Dirty Howie
I used Mobil1 and my rear started leaking ..... I'm back to stock fluid 
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by phils C5 vette
Do you guys really think the fluid type causes or fixes the leaks?
Safety Car
Joined: Jan 2005
Posts: 3,675
Likes: 58
From: Hayward (Bay Area) CA
Originally Posted by Mike Mercury
I was going to suggest the factory fluid too. Unless the car will be heavily raced, why not continue to use something that has proven itself?
Advanced
Joined: Jul 2005
Posts: 64
Likes: 1
rear end fluid !!
I had just installed the GM synt fluid & the 4oz bottle of Posi-fluid & then noticed the r/end sticking or screeching around corners/turns.
i then installed the ROYAL Purple from Auto Zone(which has posi fluid already added) & NOW the noise seems to be gone -- still not sure yet if BOTH REAR WHEELS are locked /turning at the same time - taking a trip - so will see if if works or brakes !!!!!!!!!!!!! but at least its quiet now
STILL DONT UNDERSTAND POSI & LIMITED SLIP DIFFERENCE & how they are supposed to work on C-5's (1999 w/315 axle stock)
Keith
i then installed the ROYAL Purple from Auto Zone(which has posi fluid already added) & NOW the noise seems to be gone -- still not sure yet if BOTH REAR WHEELS are locked /turning at the same time - taking a trip - so will see if if works or brakes !!!!!!!!!!!!! but at least its quiet now
STILL DONT UNDERSTAND POSI & LIMITED SLIP DIFFERENCE & how they are supposed to work on C-5's (1999 w/315 axle stock)
Keith
Racer
Joined: Dec 2005
Posts: 421
Likes: 0
From: NOVA
When I changed my fluid, i added the "friction modifier" first. Then I added the Synthetic AC Delco fluid. You are supposed to take it very easy initially. The first 2 turns the rear chattered a bit. After that, no chatter, no noise.
The issue with this: it is my understanding that the chattering is better for track use since there is less slipping so less heat.... or so I'm told. I would try Redline next time since it is considerably cheaper than the synthetic AC Delco stuff.
Late,
Tony
The issue with this: it is my understanding that the chattering is better for track use since there is less slipping so less heat.... or so I'm told. I would try Redline next time since it is considerably cheaper than the synthetic AC Delco stuff.
Late,
Tony