Differential Oil Replacement
Race Director
Joined: Apr 2003
Posts: 19,351
Likes: 654
From: Tampa, Florida
Most people never change it....Because I dont beat the heck out of my car and it has stock-ish horsepower I'll make sure it's 'topped off' once or twice a year and change it every few years.
Differential and gear boxes are designed for long oil change intervals unlike engine oil.
Differential and gear boxes are designed for long oil change intervals unlike engine oil.
Heel & Toe
Joined: Nov 2011
Posts: 19
Likes: 0
Melting Slicks
Joined: Jun 2009
Posts: 2,343
Likes: 4
From: Anderson SC
Most people never change it....Because I dont beat the heck out of my car and it has stock-ish horsepower I'll make sure it's 'topped off' once or twice a year and change it every few years.
Differential and gear boxes are designed for long oil change intervals unlike engine oil.
Differential and gear boxes are designed for long oil change intervals unlike engine oil.
GM obviously didn't think people would change it - thus the lack of a drain plug.
-W
Burning Brakes
Joined: Feb 2011
Posts: 849
Likes: 0
From: Woodland California
On a side note.
I changed my oil, drove about 1000 miles and changed it again.
It was almost as dirty the 2nd time as the 1st.
There must of been a lot of stuff in the bottom that didn't get sucked out.
R~
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
I just had the diff fluid changed in my '07 ZO6. My factory Service Manual calls for diff fluid and friction modifier as most on this thread have stated. When I reviewed the work order, I noticed they didn't use any friction modifier, so I asked the service adviser about that. We went to the parts counter together and the parts man looked up the required fluid. Seems GM decided their newest diff lube doesn't need a friction modifier.
The oil (diff fluid) the dealer put in my ZO6 is GM #88862624. The Z takes almost 4 quarts @ suggested retail of $22.46/qt.!!
Remember these cars (since MY 2007) have a 5 year/100,000 mile power train warranty, so it is not likely that GM would spec. an inferior product when repair would be on their dime if the diff frags.
Just my 2¢.
Pete
The oil (diff fluid) the dealer put in my ZO6 is GM #88862624. The Z takes almost 4 quarts @ suggested retail of $22.46/qt.!!
Remember these cars (since MY 2007) have a 5 year/100,000 mile power train warranty, so it is not likely that GM would spec. an inferior product when repair would be on their dime if the diff frags.
Just my 2¢.
Pete
Le Mans Master
Joined: Oct 2007
Posts: 7,451
Likes: 974
From: RI, Now Franklin/Nashville TN
I just had the diff fluid changed in my '07 ZO6. My factory Service Manual calls for diff fluid and friction modifier as most on this thread have stated. When I reviewed the work order, I noticed they didn't use any friction modifier, so I asked the service adviser about that. We went to the parts counter together and the parts man looked up the required fluid. Seems GM decided their newest diff lube doesn't need a friction modifier.
The oil (diff fluid) the dealer put in my ZO6 is GM #88862624. The Z takes almost 4 quarts @ suggested retail of $22.46/qt.!!
Remember these cars (since MY 2007) have a 5 year/100,000 mile power train warranty, so it is not likely that GM would spec. an inferior product when repair would be on their dime if the diff frags.
Just my 2¢.
Pete
The oil (diff fluid) the dealer put in my ZO6 is GM #88862624. The Z takes almost 4 quarts @ suggested retail of $22.46/qt.!!
Remember these cars (since MY 2007) have a 5 year/100,000 mile power train warranty, so it is not likely that GM would spec. an inferior product when repair would be on their dime if the diff frags.
Just my 2¢.
Pete
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Melting Slicks
Joined: Jun 2009
Posts: 2,343
Likes: 4
From: Anderson SC
I have been saying that the newer synthetic gear oils do not need the additive for years!!! Try convincing the nay sayers that 30,40, 50 year old rear differentials that original were spec'd for an additive back then, now do not need the additive any longer with the synthetic gear oils. I have been using Mobil 1 75W-90 synthetic gear oil with no additive for 22 years with zero issues. Good luck with that!
However, the stock lube DOES.
-W
Race Director
Joined: Apr 2003
Posts: 19,351
Likes: 654
From: Tampa, Florida
Le Mans Master
Joined: Oct 2007
Posts: 7,451
Likes: 974
From: RI, Now Franklin/Nashville TN
See post #48. I use Mobil 1 75W-90 for over 20 years but have also used Amsoil. I trust Redline Gear oil as well. If none of those work, I would trust Castrol EU as well, if they have a synthetic.
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Race Director
Joined: May 2006
Posts: 18,729
Likes: 2,579
the product says nothing about use in limited slip differentials
use this http://www.motornaolja.com/produkt/c...-slip-75w-140/
use this http://www.motornaolja.com/produkt/c...-slip-75w-140/
Last edited by MelWff; May 10, 2018 at 03:01 PM.
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
the product says nothing about use in limited slip differentials
use this http://www.motornaolja.com/produkt/c...-slip-75w-140/
use this http://www.motornaolja.com/produkt/c...-slip-75w-140/
https://www.motul.com/us/en-US/products/90-pa
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Race Director
Joined: May 2006
Posts: 18,729
Likes: 2,579
use this one unless you can find a Torco 75w90 for LSD
https://www.motul.com/us/en-US/produ...r-300-ls-75w90
https://www.motul.com/us/en-US/produ...r-300-ls-75w90
Last edited by MelWff; May 10, 2018 at 03:36 PM.
Instructor
Joined: Jun 2016
Posts: 119
Likes: 5
From: Spain
@Primo, here in Europe you can easily get Valvoline or Mobil 1 from ebay. Pay attention to the specific oil you are buying as Valvoline for example has many 75w90 gear oils but only 2 valid for limited slip differential:
https://www.valvolineeurope.com/engl...ducts/axle_oil
The Mobil 1 oil you found is not a differential oil and is not for limited slip, this is the correct one:
https://mobiloil.com/en/gear-lubrica...c-gear-lube-ls
https://www.valvolineeurope.com/engl...ducts/axle_oil
The Mobil 1 oil you found is not a differential oil and is not for limited slip, this is the correct one:
https://mobiloil.com/en/gear-lubrica...c-gear-lube-ls