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Hi all, new to the forum so pardon me if this a a dumb question. Im thinking about changing the diff oils in my 07 1500. 47000 miles on it since new and i don't think its ever been changed. I have read like 15 different recommendations of what to use and whether or not to use an anti-slip additive. What is the official thing I should do (what brand, type, and how much)? Also, can I expect a small MPG increase?
 

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I bought three quarts of Royal Purple 75W-140 for the rear, 2 quarts 75W-90 for the front. No LSD additive for the rear needed if you use the Royal Purple.
 
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