The dealer can’t advise you to use non mb parts because it’s not in their best interest and also for liability. Nothing wrong with using non mb parts it’s something you gotta do your homework on.

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero