The Lanz Bulldog D8511 is a farm tractor produced by Lanz from 1935 to 1955 as part of the D85 Series. It was built in Mannheim, Baden-Württemberg, Germany. The D8511 variant is a combination model designed for both road and field use, featuring front-axle springs. It is powered by a 10.3L single-cylinder liquid-cooled diesel engine producing 34.3 hp (25.6 kW) at 540 RPM. The tractor has a 6-speed gear transmission and a 2WD mechanical drive system.