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I plan to replace the differential oil on my 2009 Challenger RT that currently has 60K miles. The qwner's manual calls for 75-90W Gear Lube with friction modifier. My car is a RT model without limited slip so is a bottle of friction modifier still necessary? I was going to use Amsoil synthetic 75-90W lube.
 

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The Bacon Hauler (‘12 Cop Charger)
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I plan to replace the differential oil on my 2009 Challenger RT that currently has 60K miles. The qwner's manual calls for 75-90W Gear Lube with friction modifier. My car is a RT model without limited slip so is a bottle of friction modifier still necessary? I was going to use Amsoil synthetic 75-90W lube.
The open diffs don’t require the friction modifier, and usually spec 75W-140 gear oil IIRC
 

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if the weight of oil in that brand already has friction modifier - it won't harm anything in an open differential (which has no clutches) with your A5 R/T application
 

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They changed the open diff gear oil recommendation I think for 2015 (same year they went to the ZF) and now say 75W-85 or the same as the limited slip.

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I plan to replace the differential oil on my 2009 Challenger RT that currently has 60K miles. The qwner's manual calls for 75-90W Gear Lube with friction modifier. My car is a RT model without limited slip so is a bottle of friction modifier still necessary? I was going to use Amsoil synthetic 75-90W lube.
Using Amsoil you should not need it but sometimes the rear diff may require some additional modifier. I would go without it first as you want to use the smallest amount required. If you get any chattering when turning then you know you need to add it. I personally didn't need to add any using Amsoil.
 

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Run 75w140. Won’t hurt a bit may help with noisy back lash in the roof and pinion for a little bit. The more friction modifier you run the faster the clutches will wear out


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