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Differential oil leak

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I have a 2013 boss with 24K miles. It has never been tracked. While changing my oil today I noticed oil build up on the outside of the rear differential cover. It appears I may have a very small leak. Is this normal? If not, would a repair like this be under warranty? thanks Kevin
 

Grant 302

basic and well known psychic
It's probably just coming from the vent. Especially if it's coming from the top. I believe it's probably overfilled a tad from the factory. Can you post a picture of the leak?
 

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