UD Trucks Corporation is a Japanese company whose principal business is the manufacture and sales of light, medium and heavy duty diesel trucks, buses, bus chassis and special-purpose vehicles. The company is owned 100% by the Volvo Group since 2007. Formerly known as Nissan Diesel, the company changed its name to UD Trucks on February 1, 2010. Already before the name change, the UD name was prominently displayed to separate the identity from that of their former owner Nissan Motors. The UD name was originally used for the company's "Uniflow Scavenging Diesel" engine, developed in 1955, but is now marketed as meaning "Ultimate Dependability". On February 15, 2010 it was announced that UD Trucks had taken over the import and sales of Volvo trucks in Japan, as a consequence of Volvo's ownership.