They're Mechanics, and holy crap are they Popular. So popular, in fact, that they've gotten a first ride in Volkswagen's first clean-diesel Jetta. It won't be in dealerships until January '08, but the previews will likely begin in earnest before you can say "thiophene doped n-hexadecane."

2008 Volkswagen Jetta Diesel: Video Test Drive [Popular Mechanics]

Related:
Digging for Oil: Volkswagen Seeks Oldest Running VW Diesel [internal]