Alfred Matthews Buick GMC Cadillac is a Modesto Buick, Cadillac, GMC dealer with Buick, Cadillac, GMC sales and online cars. A Modesto CA Buick, Cadillac, GMC dealership, Alfred Matthews Buick GMC Cadillac is your Modesto new car dealer and Modesto used car dealer. We also offer auto leasing, car financing, Buick, Cadillac, GMC auto repair service, and Buick, Cadillac, GMC auto parts accessories.