Roy Foss Autos Chevy, Buick, GMC, and Cadillac in Woodbridge and Thornhill, Ontario offers great low prices, rebates, and incentives for new & used Chevy, Buick, GMC, and Cadillac cars, trucks and SUVs to all of our neighbors in Toronto, Mississauga, Scarborough, Markham . Our Expert Service & Parts staff assist our Ontario customers keep their Chevy, Buick, GMC, and Cadillac vehicles in great shape. more... See more text