Behlmann Buick GMC, Near Wentzville, has an huge selection of Used Cars, Trucks, Vans & Suvs . Shop Great Deals On Quality Pre-Owned Vehicles near Wentzville today. Behlmann Buick GMC, serving the Wentzville, TROY, O’Fallon and the Greater St Charles, Lincoln, Warren & St Louis counties area for great offers on pre-owned cars, trucks, vans and SUV needs. We take great pride on our customer service before & after the sell. We have a huge selection of used vehicles near Wentzville. Most of our vehicles are in like-new condition and have been thoroughly inspected by our certified technicians to the highest standards.