XM, a satellite radio service, and General Motors Corp. recently launched a satellite radio trial program for GM certified used vehicles, Cadillac certified pre-owned vehicles, and Hummer certified pre-owned vehicles – making the XM trial program available to buyers of both new and certified used models. XM will be available in more than 115,000 of these certified GM vehicles in 2007, and grow to more than 168,000 vehicles in 2008. Under this program, all GM certified used vehicles (Chevrolet, Pontiac, Buick, GMC, Oldsmobile models), Cadillac and Hummer certified pre-owned vehicles equipped with XM Radio will be available with three trial months of XM service and a waived activation fee. A list of previous model year Chevrolet, Pontiac, Buick, GMC, Oldsmobile, Cadillac and HUMMER vehicles factory-equipped with XM can be found online at InYourVehicle.