About this event
Join us at MBCA Peachtree Section Sponsor DC Motorwerks (640 James Road Alpharetta, GA 30004) on February 11th at Noon for an informative session discussing this potentially expensive (if not caught in time) issue with M156 Engines.
Most M156-equipped Mercedes-Benz models up to model year 2012 have cylinder head bolts that have the propensity to break at the bolt head, allowing coolant to enter the combustion chamber. The cutoff for engines not affected by this design flaw is engine serial number 60-060658. You can find the engine serial number located on a white sticker affixed to the left valve cover.
Early warning signs include a low coolant light, misfires, coolant in the oil, and a check engine light. If you are uncertain of the bolts that are currently installed in your vehicle, it is best to remove the valve covers and physically verify what is in the vehicle.