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additive or not?


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Posted

I am about to change the rear diff fluid in my truck. After searching I am a bit lost about if i need to purchase the additive or not from gm. In all my older gm vehicles, 91 Trans AM GTA, and 98 S10 SS, I added the locking additive. Is this not the case anymore? I plan on using Mobil 1 75w90 synthetic. Thanks! :(

Posted

Synthetic gear oil like the Mobil 1 you are using is GL5 rated. It has the correct friction modifiers (additive) for your G80 and all other limited slip rear diffs. No need to add more!

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