I would say if you keep the engine well cared for and serviced, you should not have any trouble out of it. DO NOT use any products that are not approved for this engine by Mercedes...If you di have any trouble and they did an oil analisys, they could void your warranty for this.
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM