Differential Fluid Change! Yuck!
Thread Starter
Melting Slicks
Joined: Aug 1999
Posts: 2,460
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From: Rocklin CA
Differential Fluid Change! Yuck!
I have 34,000 miles on my 97 MN6 Coupe. I thought it might be time to change the gear oil. I put in GM's synthetic gear oil! No need for the additive.
$26.95 a quart. It takes 1.6 quarts or just over 1 liter.
The old oil was pretty bad, very dark and smelled like crude oil!
After we drained it we ran a quart of gear oil thru it spun the tires around in both directions (by hand) let it sit. And drained it again. After seeing how bad that oil was I’m glade we ran a quart thru, that oil was pretty dirty also. Then added the new synthetic oil!
Labor $20.00
Extra Gear Oil 6.95
GM Gear oil $53.90
Total around $80.00 with tax.
I wish I would have done it sooner!
T
:eek:
$26.95 a quart. It takes 1.6 quarts or just over 1 liter.
The old oil was pretty bad, very dark and smelled like crude oil!
After we drained it we ran a quart of gear oil thru it spun the tires around in both directions (by hand) let it sit. And drained it again. After seeing how bad that oil was I’m glade we ran a quart thru, that oil was pretty dirty also. Then added the new synthetic oil!
Labor $20.00
Extra Gear Oil 6.95
GM Gear oil $53.90
Total around $80.00 with tax.
I wish I would have done it sooner!
T
:eek:
Team Owner
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Re: Differential Fluid Change! Yuck! (C54TIM)
I did my own, very easy to do and no GM Crappy Service to deal with 
Mark
Mark
Race Director
Joined: Aug 2000
Posts: 11,188
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From: Scarborough ME
Re: Differential Fluid Change! Yuck! (Mean Green 2000)
I did my own, very easy to do and no GM Crappy Service to deal with
Mark
Mark
[Modified by wstory1, 8:14 PM 8/15/2001]
Le Mans Master
Joined: Apr 1999
Posts: 8,655
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From: Long Island, NY
Re: Differential Fluid Change! Yuck! (C54TIM)
Unless something changed very recently, youy need to add the Limited Slip Differential Additive with either the synthetic or standard gear oil.
Thread Starter
Melting Slicks
Joined: Aug 1999
Posts: 2,460
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From: Rocklin CA
Re: Differential Fluid Change! Yuck! (BruceF)
Can some one verify that the Gear lube I bought has the additive already in it?
The part number of the GM gear lube is 012346140.
I asked the parts manager if I needed the additive and he "said I didn't need it, the additive was already in it"!
For the price I paid for the gear lube, I would hope that it was allready in it?
I didn't have the dealer do the change I had a friend do it. I just bought the gear lube from the dealer.
T
[Modified by C54TIM, 8:21 AM 8/16/2001]
The part number of the GM gear lube is 012346140.
I asked the parts manager if I needed the additive and he "said I didn't need it, the additive was already in it"!
For the price I paid for the gear lube, I would hope that it was allready in it?
I didn't have the dealer do the change I had a friend do it. I just bought the gear lube from the dealer.
T
[Modified by C54TIM, 8:21 AM 8/16/2001]
Drifting
Joined: Aug 2000
Posts: 1,355
Likes: 0
From: NY NY
Re: Differential Fluid Change! Yuck! (C54TIM)
Another redline use here:yesnod:(I know redline has all required additives). Did this with the help of my freindly neighborhood mechanic and did both trany and diff changes at same time. Cost was about $7 per quart (+shipping) for the redline fluids + $20 to my mechanic. Also make sure you get a piece of clear tubing, at least 1/2" x 6' and a funnel that fits into the tubing, if you have these it will make filling both the trany and diff very easy.
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
Re: Differential Fluid Change! Yuck! (C54TIM)
I always use Mobil 1 synthetic lube @ $6.95. I think you had better use some limited slip fluid too; check it out and don't drive too far until you get the answer about that GM stuff. For what you paid, it should have it in but I would doubt that it does. :crazy:
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Re: Differential Fluid Change! Yuck! (C54TIM)
Can some one verify that the Gear lube I bought has the additive already in it?
The part number of the GM gear lube is 012346140.
I asked the parts manager if I needed the additive and he "said I didn't need it, the additive was already in it"!
For the price I paid for the gear lube, I would hope that it was allready in it?
I didn't have the dealer do the change I had a friend do it. I just bought the gear lube from the dealer.
T
[Modified by C54TIM, 8:21 AM 8/16/2001]
The part number of the GM gear lube is 012346140.
I asked the parts manager if I needed the additive and he "said I didn't need it, the additive was already in it"!
For the price I paid for the gear lube, I would hope that it was allready in it?
I didn't have the dealer do the change I had a friend do it. I just bought the gear lube from the dealer.
T
[Modified by C54TIM, 8:21 AM 8/16/2001]
GM Synthetic gear oil part number 12378261
GM posi additive part number 1052358
Notice the gear oil number is different. It might be worth calling and asking the difference between part numbers. Nothing on the bottle indicated it already had the posi additive?
Kurt
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Le Mans Master
Joined: Apr 2000
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From: Houston,Tx. USA
Re: Differential Fluid Change! Yuck! (C54TIM)
The foul smell was not due to wear; all gear lube stinks right out of the jug IMHO. Believe I'll be doing the tranny and gear at 50K (soon).
Thread Starter
Melting Slicks
Joined: Aug 1999
Posts: 2,460
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From: Rocklin CA
Re: Differential Fluid Change! Yuck! (Chopper Larry)
Here's the latest on the Diff fluid:
I talked to the service advisor about the Diff fluid, and he talked to there Vette mechanic. The mechanic said that the new synthic diff fluid, doesn't have the additive and they are seeing problems with that fluid.
(What the heck did I pay $26.95 for?)
So out it goes.
Next week when my new Cartec Clutch comes in, I'll have them drain the diff oil and put in redline and the additive.
I'm going to have them save the fluid so I can get my money back. What a bunch of crap!
The parts manager says one thing and the mechanics say another. Is money that important that you have to sell your customers crap just so you can make you quota!
I guess I won't be buying any more GM parts from that Guy!
Tim
:mad
I talked to the service advisor about the Diff fluid, and he talked to there Vette mechanic. The mechanic said that the new synthic diff fluid, doesn't have the additive and they are seeing problems with that fluid.
(What the heck did I pay $26.95 for?)
So out it goes.
Next week when my new Cartec Clutch comes in, I'll have them drain the diff oil and put in redline and the additive.
I'm going to have them save the fluid so I can get my money back. What a bunch of crap!
The parts manager says one thing and the mechanics say another. Is money that important that you have to sell your customers crap just so you can make you quota!
I guess I won't be buying any more GM parts from that Guy!
Tim
:mad
