Surprise! Yet another massive recall from a US auto maker.  General Motors is warning the owners of 207,542 Buick Regal and Pontiac Grand Prix sedans not to park them in garages because they can catch fire.  The automaker said Friday of last week it is recalling the 1997-2003 Buick Regal GS and Grand Prix GDP models with 3.8-liter supercharged V-6 engines.Apparently, during hard braking, oil can leak from the engine onto the exhaust manifold, and fires can start if the oil gets hot enough, the National Highway Traffic Safety Administration said on its website.  GM sent letters to the owners on Thursday telling them the vehicles are safe to drive, but they should not be parked in garages or carports until the problem is repaired.  The problem has caused 267 vehicle fires and six injuries, five of them minor and one moderate.  It also has caused 17 structure fires.