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Audi A5 Differential oil additiv recommendations


Hello, I bought oil to change for my audi a5 differentials (front, middle and back) I got info that I need to use additiv for the middle one mainly incase vibration/noise. Anyone have any recommeded oil additives I could buy?
Audi a5 3.0 Coupe Quattro 2008. Thank you

If that info came from the Audi owners or service manual, buy that additive from the Audi dealer. The specified additive should have a part number or description in the manual or you can ask the guy at the parts counter for the right one. Do not gamble a very expensive repair guess if an additive will work. If that info came from an Audi forum, ask them what they recommend.

Do you know for a fact that this oil fully meets Audi specifications?