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When the second season of Volkswagen's Jetta TDI Cup kicks off next week at VIRginia International Raceway, three guest drivers will join the 30 regulars on the track. Former NASCAR driver Ward Burton's son Jeb will be driving one of the 170 hp diesel powered Jettas along with MSNBC's Dan Carney. The third guest is free-skier Simon Dumont, who has won multiple gold medals in the X-games for his aerial antics. Hopefully, Dumont will manage to keep the rubber on the tarmac at VIR.

Most manufacturers, including heavy-hitters like Volkswagen and Mercedes-Benz, allow the use of a 5 percent biodiesel blend (aka B5) without violating the terms of the car's original factory warranty. What happens if you use a higher biodiesel concentration? That's a good question, and the answer isn't particularly clear at the moment. According to Steve Keyes, Volkswagen's director of public relations, "All Volkswagen TDI models are warranted for the use of up to a B5 blend. Blends of biodiesel