I wouldn't remember it for too long. It's one of those great Mercedes myths. OE manufacturers make parts to OE specs. They don't go to the trouble of dumbing down the production line so that the non-dealer parts can fail prematurely and damage their good name that was on the box. Premature motor mount failure at the dealership is very common especially on heavier motors. This is not to say that there aren't bad motor mounts, or other aftermarket parts, available through non-dealer sources.