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Old 07-09-2020, 01:39 PM   #1
Jvert18
 
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Drives: 18 2LT RS V6 M6 Vert
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Rear Diff additive??

2018 V6 M6


Changing the rear diff fluid. Went to the dealer for part number listed in the manual. GM 88862624 Dexron LS Gear oil. Parts told me I also needed an LS additive, GM 88900330. Doesn't the Dexron already have the additive? Manual does not mention the additive (that I can find). Anybody adding this additive?
Thanks!!
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Old 07-09-2020, 08:07 PM   #2
MatthewAMEL

 
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The additive is already in the fluid. You do not need to add more.
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