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I need to change front and rear diff fluids in my truck. It as the G80. Is it ok to run Mobil 75w-90 sythetic in the diffs instead of 80W-90? I'm also going to change the fluids front and rear in an 07 Avalanche and 06 Envoy. Is it ok to use that weight in those as well? Do I need to put any additives in the oil before I put it in?
 

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75W-90 is what you use front and rear, 80W-90 is not recommended.



From the 2008 owners manual

Front and Rear Axle: SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 89021677, in Canada 89021678) meeting
GM Specification 9986115.

Transfer Case: DEXRON®-VI Automatic Transmission Fluid
 
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