Winegardner Buick GMC in BRANDYWINE - New & Used Cars for Sale, Auto Repair Shop Near Waldorf, MD. 1. Excludes SL models. Not available with lease, special finance and some other offers. Take new retail delivery by 11/01/21. 2. Excludes SL models. MUST BE A CURRENT OWNER OF A 2007 MODEL YEAR OR NEWER BUICK OR GMC VEHICLE OR A CURRENT LESSEE OF A 2016