2013 MERCEDES-BENZ C204.9 Engine Problems

MY MECHANIC TOLD ME THAT MY 2013 MERCEDES C250 HAS A TIMING CHAIN/CAMSHAFT ADJUSTER SPROCKET PROBLEM AND THAT IT HAPPENS A LOT ON THESE CARS. I FOUND HUNDREDS OF OTHER PEOPLE ONLINE WITH THE SAME PROBLEM. IT STARTS USUALLY AS SOON AS THE WARRANTY ENDS. THE COST TO FIX IT AT THE DEALERSHIP IS $5600. IT IS POTENTIALLY DANGEROUS AS YOUR ENGINE WILL EVENTUALLY GET DAMAGED WHILE YOU ARE DRIVING AND CAUSE A TERRIBLE ACCIDENT.

NUMEROUS COMPLAINTS ABOUT SPUTTERING OR SHUDDERING WHEN STARTING MY CAR ALONG WITH GRAYISH BLUE/BLACK SMOKE FROM EXHAUST. I ALSO HAVE HAD CASES OF DRIVING ON THE HIGHWAY AND THEN IT HESITATES, WHICH PUTS MY FAMILY AND I IN DANGER . DEALERSHIP CLAIMS THEY COULD NOT FIND ROOT CAUSE AND THEY STATED IT WAS WORKING TO MB SPECIFICATION. EVENTUALLY I GOT A CHECK ENGINE LIGHT JUST WHEN IT GOT OUT OF EXTENDED WARRANT AND THEN THE STATED I HAD GOTTEN OIL THROUGH MY CAMSHAFT SENSORS AND THEN THROUGH MY HARNESS. COST OF REPAIR WAS OVER 10K. SUBSEQUENTLY ABOUT A YEAR LATER I HAVE BEEN GETTING THE SAME SPUTTERING AND SHUDDERING WITH THE SAME SMOKE AND THEY ARE NOW SAYING I HAVE SOME TIMING ISSUE CODES. I HAVE THEY CAR SINCE IT WAS BRAND NEW AND BOUGHT AN EXTENDED WARRANTY TOOK IT TO THE DEALER FOR EVER REPAIR AND MAINTENANCE. THE ISSUE...