According to Mercedes-Benz, in house testing to replicate a worst case scenario frontal crash, has uncovered a problem that could result in an engine fire. Testing of certain 2013 Mercedes-Benz SL-Class vehicles manufactured from December 19, 2011, through May 31, 2012, showed that if the air conditioner refrigerant line should rupture, the gaseous mixture released into the engine compartment could ignite and quickly spread. Mercedes will be asking owners of these vehicles to bring them in to have the refrigerant and all associated lines replaced. Owners wanting more information about the problem can contact Mercedes-Benz at 1-800-367-6372.