Mercedes-Benz: U.S. fuel too dirty for next-gen efficient engines

S. contains sulfur at the rate of 95 parts-per-million; about twice as much as can be tolerated by the new engines. The problem? Excess sulfur apparently clogs the nitrogen oxide-capturing traps. S. the only country lagging behind Europe in removing sulfur from its gasoline supply? Far from it. Heil points out that the gasoline in Africa and many areas of Asia also contain too much sulfur for the lean engines. 5-liter V6 destined for the C350 sport sedan and the SLK roadster seen above.

Mercedes-Benz: U.S. fuel too dirty for next-gen efficient engines