Now, this is cool. You've likely seen the Mercedes-Benz diesels of the 1980s and 1990s chugging along somewhere or other. But how much better are today's clean diesels than the solid old oil-burners ...

This black Mercedes 190 is far from the first Mercedes-Benz diesel car converted to run on used cooking oil--but it's probably the first to get its own rap song. This (NSFW) rap video was created by a ...