This vehicle is being liquidated at a wholesale value., , The Pontiac Bonneville was once a quintessential American car: large, roomy and fast. The name disappeared from the Pontiac line for a time, but re-emerged when General Motors introduced its new line of front-wheel-drive full-size sedans. The Bonneville's 3.8-liter V6 engine differs from most of its competitors by having pushrod-operated valves instead of overhead camshafts, a design choice Pontiac says reduces weight and complexity. Topping the Bonneville pecking order the past few years is the SSEi. Its supercharged engine and high comfort and convenience levels placed it in competition with many near-luxury imports.