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Old Oct 4, 2022 | 10:43 PM
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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
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Old Oct 4, 2022 | 11:19 PM
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Yes
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Old Oct 5, 2022 | 12:30 PM
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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......
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Old Oct 5, 2022 | 01:33 PM
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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.
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Old Oct 5, 2022 | 03:42 PM
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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.
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Old Oct 6, 2022 | 02:07 AM
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Old Oct 6, 2022 | 03:00 PM
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Thanks for all the input..
Al
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Old Oct 6, 2022 | 09:25 PM
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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.


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Old Oct 6, 2022 | 09:40 PM
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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
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Old Oct 7, 2022 | 10:57 AM
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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.
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Old Oct 7, 2022 | 11:29 AM
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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.
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Old Oct 7, 2022 | 11:54 AM
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the part # my local dealer has for ac delco is different than #s in US, not sure if is the same lube.
89021678
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Old Oct 7, 2022 | 03:15 PM
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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
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Old Oct 7, 2022 | 05:56 PM
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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.....
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Old Oct 7, 2022 | 08:20 PM
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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?

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Old Oct 7, 2022 | 08:23 PM
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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.
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Old Oct 7, 2022 | 08:27 PM
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this probably another reason why i will try the Mobil 1
Amazon Amazon
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Old Oct 7, 2022 | 08:36 PM
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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.
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Old Oct 8, 2022 | 01:29 PM
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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.
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Old Oct 8, 2022 | 02:49 PM
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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.
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