C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

diff oil

Thread Tools
 
Search this Thread
 
Old Oct 4, 2022 | 10:43 PM
  #1  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default diff oil

does the Mobil 1 synthetic LS 75/90 gear oil have the modifier in it already ?
as opposed to the Mobil 1 synthetic gear oil that i think does not have it in ?
tia
Reply
Old Oct 4, 2022 | 11:19 PM
  #2  
493lszosix's Avatar
493lszosix
Pro
Photogenic
Liked
Loved
Top Answer: 1
 
Joined: Dec 2015
Posts: 661
Likes: 182
From: Knoxville TN
Default

Yes
Reply
Old Oct 5, 2022 | 12:30 PM
  #3  
grinder11's Avatar
grinder11
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Default

Unless you are roadracing, with very high diff temps, and need the best high temp lube on the face of the Earth, the local Chevy dealer has what you need, premixed!! Competitive prices, too......
Reply
Old Oct 5, 2022 | 01:33 PM
  #4  
v6turbo87's Avatar
v6turbo87
Pro
All Eyes On Me
Top Answer: 1
 
Joined: Jan 2016
Posts: 524
Likes: 126
From: Sandown NH
Default

Originally Posted by walleyejack
does the Mobil 1 synthetic LS 75/90 gear oil have the modifier in it already ?
as opposed to the Mobil 1 synthetic gear oil that i think does not have it in ?
tia
"LS" stand for "Limited Slip" meaning it has the additive.
Reply
Old Oct 5, 2022 | 03:42 PM
  #5  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Originally Posted by grinder11
Unless you are roadracing, with very high diff temps, and need the best high temp lube on the face of the Earth, the local Chevy dealer has what you need, premixed!! Competitive prices, too......
they have ac delco with no additive $22 for 946 l.
Reply
Old Oct 6, 2022 | 02:07 AM
  #6  
vette4fl's Avatar
vette4fl
Le Mans Master
Community Influencer
Photoriffic
Shutterbug
Community Favorite
 
Joined: Feb 2021
Posts: 6,503
Likes: 4,351
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Default

RedLine
Reply
Old Oct 6, 2022 | 03:00 PM
  #7  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Thanks for all the input..
Al
Reply
Old Oct 6, 2022 | 09:25 PM
  #8  
Prop Joe's Avatar
Prop Joe
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 3
 
Joined: Feb 2022
Posts: 897
Likes: 987
From: NW Burbs of Chi-Town
2025 C5 of the Year Finalist - Modified
Default

I was under 50k miles on a 1998 when I bought my car in March, 2022. 24 year old car...I couldn't make up my mind so I went with the OEM stuff. AC Delco price is all over the place on the web. My closest local Chevy dealer closed about a decade ago. (My childhood home was across the street, worked there in high school). I ended up getting fluids on ebay, seeking free delivery at the best price. All fluids in the pic below came from GM dealers that sell on ebay.


Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Oct 6, 2022 | 09:40 PM
  #9  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Originally Posted by Prop Joe
I was under 50k miles on a 1998 when I bought my car in March, 2022. 24 year old car...I couldn't make up my mind so I went with the OEM stuff. AC Delco price is all over the place on the web. My closest local Chevy dealer closed about a decade ago. (My childhood home was across the street, worked there in high school). I ended up getting fluids on ebay, seeking free delivery at the best price. All fluids in the pic below came from GM dealers that sell on ebay.
thanks.. Picked up some Mobil 1 LS 75/90 $10 cheaper than the Delco stuff.. and need to add modifier with it
Reply
Old Oct 7, 2022 | 10:57 AM
  #10  
MetalMan2's Avatar
MetalMan2
Melting Slicks
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Dec 2018
Posts: 2,659
Likes: 1,386
From: Orange County, CA
Default

Will be interesting to hear your feedback on it. In a thread of mine there was some discussion about Mobil 1 LS fluid, in which I had freshly installed C6 Z06 clutch packs. Here are some quotes from that thread:

Originally Posted by Dutch08
FYI, I used Mobile 1 LS and after about 50 miles the diff sounded like it had sand it when turning. I switched back to GM AC Delco Diff fluid and a couple of figure 8's later it was perfect. In hindsight, I think I should have added friction modifier to the Mobile 1 and it probably would have been fine.
Originally Posted by MetalMan2
I'm up to 150 miles so far since rebuilding everything... I'm hearing a little noise from the rear diff on tight turns. I might need to consider Dutch08's suggestion of playing with the diff fluid (i.e. adding friction modifier). The current fluid is Mobil 1 LS 75W-90.
Originally Posted by MetalMan2
It's been almost 500 miles since the diff fluid drain/re-fill [after replacing Mobil 1 LS fluid], and I'm happy to report that the AC Delco fluid has resulted in ZERO diff noise! DO NOT BUY MOBIL 1 LS DIFF FLUID.
Reply
Old Oct 7, 2022 | 11:29 AM
  #11  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Originally Posted by MetalMan2
Will be interesting to hear your feedback on it. In a thread of mine there was some discussion about Mobil 1 LS fluid, in which I had freshly installed C6 Z06 clutch packs. Here are some quotes from that thread:
HMMM. interesting..
thanks MM

parts where supposed to be here today.. fedex is lost in space.. Indy In > Toledo Oh, then to me, no, lets send it to fort worth tx
first,, said Tuesday now.. FE not working monday cuz Turkey day here.
Reply
Old Oct 7, 2022 | 11:54 AM
  #12  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

the part # my local dealer has for ac delco is different than #s in US, not sure if is the same lube.
89021678
Reply
Old Oct 7, 2022 | 03:15 PM
  #13  
MetalMan2's Avatar
MetalMan2
Melting Slicks
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Dec 2018
Posts: 2,659
Likes: 1,386
From: Orange County, CA
Default

Originally Posted by walleyejack
the part # my local dealer has for ac delco is different than #s in US, not sure if is the same lube.
89021678
This is what I put in: AC Delco 10-4034
Amazon Amazon
The P/N cross-references to 88862624
Reply
Old Oct 7, 2022 | 05:56 PM
  #14  
grinder11's Avatar
grinder11
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Default

Originally Posted by MetalMan2
This is what I put in: AC Delco 10-4034 https://www.amazon.com/dp/B008BZS6J8
The P/N cross-references to 88862624
Yup-Thats the stuff. I think the old# is the 88862624#. I got to 100,000 miles before I changed it, and figured if it was good enough to last 15 years and 100,000 miles, it'd last until 200,000 before I needed to change it again.....
Reply
Old Oct 7, 2022 | 08:20 PM
  #15  
1999corvettels1's Avatar
1999corvettels1
Safety Car
15 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Jul 2010
Posts: 3,995
Likes: 386
From: Chandler AZ
Default

I bought 2 bottles of mobile one gear oil with the the stuff added already, but have not changed it yet.

Now I’m wondering if I should not run it, or try and if there is noise just change to the AC Delco kind?

Reply
Old Oct 7, 2022 | 08:23 PM
  #16  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Originally Posted by 1999corvettels1
I bought 2 bottles of mobile one gear oil with the the stuff added already, but have not changed it yet.

Now I’m wondering if I should not run it, or try and if there is noise just change to the AC Delco kind?
i m thinking that is what i will do.. i have it, may as well use it.
Reply
Old Oct 7, 2022 | 08:27 PM
  #17  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

this probably another reason why i will try the Mobil 1
Amazon Amazon
Reply

Get notified of new replies

To diff oil

Old Oct 7, 2022 | 08:36 PM
  #18  
Supercharged111's Avatar
Supercharged111
Safety Car
10 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
Default

I put 2 bottles of whatever dino 75w90 was on the shelf at AutoZone. Lit both tires off at the autox and doesn't chatter around town.
Reply
Old Oct 8, 2022 | 01:29 PM
  #19  
Prop Joe's Avatar
Prop Joe
Burning Brakes
Liked
Loved
Community Favorite
Top Answer: 3
 
Joined: Feb 2022
Posts: 897
Likes: 987
From: NW Burbs of Chi-Town
2025 C5 of the Year Finalist - Modified
Default

I do try and avoid the big A when I can. Ebay has several options. I'm sure you can get a hold of these guys and order more or less quantities from the 3-pack they have on this listing:
https://www.ebay.com/itm/27441082703...3ABFBM6uOWifdg

$5 for shipping quantity of 3 here:
https://www.ebay.com/itm/35376445002...Bk9SR-rjlon3YA

I was told by my local NAPA that the Mobil 1 was on back order and I used Valvoline GL5, 75-90W synthetic on the wife's 4Runr diff's last month. Very easy to use plastic dispenser and no need for a pump with that brand. Amsoil has the same easy to use packaging. I have enough AC Delco fluids to do the Corvette diff fluid & additive plus M6 trans again. If I see it cheap on ebay, I snag it to put on the shelf.
Reply
Old Oct 8, 2022 | 02:49 PM
  #20  
walleyejack's Avatar
walleyejack
Thread Starter
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Default

Originally Posted by Prop Joe
I do try and avoid the big A when I can. Ebay has several options. I'm sure you can get a hold of these guys and order more or less quantities from the 3-pack they have on this listing:
https://www.ebay.com/itm/27441082703...3ABFBM6uOWifdg

$5 for shipping quantity of 3 here:
https://www.ebay.com/itm/35376445002...Bk9SR-rjlon3YA

I was told by my local NAPA that the Mobil 1 was on back order and I used Valvoline GL5, 75-90W synthetic on the wife's 4Runr diff's last month. Very easy to use plastic dispenser and no need for a pump with that brand. Amsoil has the same easy to use packaging. I have enough AC Delco fluids to do the Corvette diff fluid & additive plus M6 trans again. If I see it cheap on ebay, I snag it to put on the shelf.
Shipping:
US $12.80 International Priority Shipping to Canada via eBay's Global Shipping Program | See detailsfor shipping
Located in: Reading, Pennsylvania, United States
Import charges:
Est. $11.19 Amount confirmed at checkout

2nd link is mucht the same.
Shipping:
US $12.91 International Priority Shipping to Canada via eBay's Global Shipping Program | See detailsfor shipping
Located in: Chicago, Illinois, United States
Import charges:
Est. $10.51 Amount confirmed at checkout

i picked up the mobil 1 LS 75/90 the other day, will probably try it because can t find acdelco 10-4016 or 88862625 dexron ls gear oil.
all i see in my area is 89021678,

Last edited by walleyejack; Oct 8, 2022 at 03:03 PM.
Reply



All times are GMT -4. The time now is 04:02 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE