Interesting, didn't listen to the whole thing. Mercedes motor mounts are known to go bad. Unlike other cars, they use a liquid filled mount which I guess just isn't as durable a big hunk of rubber like other makes, but makes for a smoother running engine when it works. I guess they didn't get an extended warranty, MB sells them in the US, you can go 7 years, 100k. I guess if he had one, he'd just be driving a loaner til they go the part in. Yep, S class can be a little scary, you have to be able to afford the car and the price of repairs.