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I have a 08 Challenger with 10k miles on it, though rear diff oil should last about 25-30k I feel simply due to the age I should change it out....my question is, what is the best rear diff oil to use? I've always liked royal purple but now I hear iffy things about it, can I buy the oil and then just take it to the dealer and pay for labor + filter?

Thanks in advance! Btw when should I change out the transmission fluid?
 
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