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I'm going to use 75W-90W since the vehicle is used in Wisconsin.

Might increase fuel milleage but is easier to roll in winter months for sure.
 

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Don't do that, 75-90 is made for cars, not trucks or SUVs. The amount that you gain in fuel mileage could be more than offset by premature differential failure that won't be covered by warranty. I'd use 75-140, that's what's recommended by Jeep for the diffs due to the wear and heat they generate.
 
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