Mercedes-Benz USA, LLC (MBUSA) is recalling certain model year 2008-2011 C300 Sedan, C300 4matic Sedan, C350 Sedan, C63 AMG Sedan vehicles, 2010-2011 GLK350, GLK350 4-Matic and E350 Coupe vehicles, 2011 SLS AMG, E350 Convertible, E550 Coupe and E550 Convertible vehicles originally sold, or ever registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands, or "Zone A." Additionally, unless included in "Zone A" above, MBUSA is recalling certain model year 2008 C300 Sedan, C350 Sedan, C63 AMG Sedan and C300 4-Matic Sedan vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Vehicles not originally sold or ever registered in either Zones A or B are not subject to this safety recall. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.