A friend recently bought a used Mercedes-Benz AMG C63 with about 5500km on the clock, and he told me that at the 10,000km service the differential must be overhauled/serviced at a cost of $10,000! I find this hard to believe. Have you heard anything about this?
I HAVEN'T and I couldn't believe it, but I contacted Mercedes-Benz to check anyway. It confirmed my belief that your friend's information was incorrect, but to be sure Benz told us it would contact you to get more information and hopefully set your friend's mind at rest.