A service question?
It seems early to me, but I'm not as experienced as most on the forum.
Either way, you can ask the mechanic to see the worn plugs. If they are worn then you'll have to replace them. If you're out of warranty (which a 2011 may be) then you will be out of luck getting MB to cover it.
Excessive idling can also wear them out so that could lead to a low mileage plug replacement.
Last edited by LogicalApex; Apr 10, 2015 at 04:38 PM.



