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Hello, I wanted to ask everyone's opinion here about what to do. Bought a brand new Audi A8 2018 model in October 2017. Time came for the oil change at 10k mile service. I asked the dealership to give me an oil sample for testing. Sample was sent to the laboratory for testing and came back...

In some differentials, some manufacturers have "large" tolerances in seals. Well, they may consider it large. However...synthetic gear oils have a more uniform, "smaller", molecular size. This may cause the oil to bypass the seals that would otherwise stop a mineral oil. (not the very best kind...