Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Sorry for the extended wait time you've experienced, I've only just come online now and would like to assist you with your question.
I'd say to 1st check the level of the engine coolant as if its burning coolant inside the engine then this will produce white smoke
what I do think is more likely though is this is just condensed water inside the exhaust so perfectly normal
so if the coolant level is not dropping then its nothing to worry about
no warning lights is a good sign
if you take a look at the attached image you'll see the coolant tank is marked 'E'
undo the cap ( ensure its cold 1st) and check teh coolant level is up to the 'max' mark on the side
sorry I meant to say its marked 'C'