Wheelies: The Trading Places Edition General Motors announced the appointment of Mark Adams, formerly the head of design for G.M. Europe, to lead global design for Buick and Cadillac. He will relocate to Michigan from Germany and report directly to Ed Welburn, the G.M. vice president of global design. David Lyon, executive director of interior design for G.M."s North American operations, will replace Mr. Adams in Germany. Both appointments become effective Aug. 1. AutoTrader Group, which owns and operates the online automotive marketplace AutoTrader.com, recently filed for an I.P.O. with the Securities and Exchange Commission. The valuation of the offering is $300 million. AutoTrader bought Kelley Blue Book, the used-car valuation service, for an undisclosed sum in 2010. S.E.C., via VentureBeat The BMW Guggenheim Lab, the traveling urban think tank that encountered militant opposition for its plan to set up in the Kreuzberg district of Berlin, opened on June 15 in that city's Prenzlaur Berg district. The lab, organized by the Solomon R. Guggenheim Foundation and BMW Group, faced a "high hazard assessment" by authorities before its scheduled opening on May 24 in Kreuzberg, a historically working-class district where luxury condominiums and other development projects have bred tension within the community. The hostility prompted BMW and the Guggenheim to seek an alternative site for the lab. Domus The GT1 World Championship, which started in 2010, may not return in 2013 if more manufacturers do not join the series by Aug. 30. The ultimatum was issued June 15 by the F.I.A., the series" governing body. Eight teams representing eight manufacturers have raced in 2012, most recently at the Slovakia Ring on June 10. Autosport Mazda intends to sell racing versions of its Skyactiv-D diesel engine to privateer teams intending to compete next year at the 24 Hours of Le Mans. The engine is based on a turbocharged 2.2-liter 4-cylinder block. Dempsey Racing, co-owned by Patrick Dempsey, has committed to using the engine next year in an LMP2 racecar. Audi swept the podium last weekend, with a diesel-hybrid entry winning the race. Mazda