The 1984 and 1985 Buick Riviera Convertible were equipped with a single engine option. The standard, and only, engine available was a 3.8-liter (231 cubic inch) V6 engine, designated as the Buick V6. This engine was chosen to provide a balance of performance and fuel efficiency for the vehicle.
The decision to utilize a V6 engine reflected the automotive industry trends of the mid-1980s, which emphasized improved fuel economy without sacrificing the driving experience associated with luxury vehicles. This engine choice aligned with the Riviera’s positioning as a personal luxury car, offering a blend of comfort, style, and reasonable operating costs.