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Need HELP with my 2015 Buick Regal GS rear PTU Fluid choice

old fart

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Regal AWD GS
I need to replace a Axle on my Regal, in do so I know I will lose Fluid from the PTU, Buick wants $93 for .75 qt for the GM Fluid that they would replace it with. I have found the the specs on the fluid are 75/90 full Synthetic. can any one recommend a fluid they have used for this? Thanks for your time
 
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