[beworthy3]

Is Mobil 1 synthetic gear lubricant LS ok for rear diff fluid? Couldn’t find the ac delco

[Tim M]

I purchased thru Amazon - easy, peasy.

Not sure about other fluids...

[Warrior102]

I would not screw around with this rear end, get the OEM oil, you'll need at least two quarts.

Oil - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Pump - https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

[Eldi Z]

Originally Posted by beworthy3

Is Mobil 1 synthetic gear lubricant LS ok for rear diff fluid? Couldn’t find the ac delco

There is no issue to use any high quality synthetic gear lubricant that is up to spec with its weight (75W90 in our case) and that includes a Limited Slip (LS) additive in its formula.

High Quality examples, apart from "AC-Delco" branded (which is BtW manufactured by Petro-Canada):
https://lubricants.petro-canada.com/...dexron-product

Would be:

The OP's finding
Mobil
- https://www.mobil.com/en/lubricants/...ube-ls-75w-90/

Valvoline
- https://www.valvoline.com/en-ecuador...hetic-gear-oil
Motul
- https://www.motul.com/us/en-US/produ...r-300-ls-75w90
Castrol
- https://www.castrol.com/en_cr/ccsa/h...ed-slip-75w-90

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*Maybe a point to bear in mind, that if you intend to perform the fluid change as part of the official maintenance schedule (I believe due for the Diff at 45K or 60K Miles? I dont remember..), then in order to keep your warranty in tact, you must prove that you used the AC Delco / GM branded material.
Anything earlier than this millage/official schedule, just use any of the above without mentioning the change to anyone (I.E. Dealership, Etc.) and you shall be 100% fine.

[beworthy3]

Great info all, I think im just going to play it safde and go with the AC delco