The Nuffield M tractor was the first tractor model produced by the Nuffield organisation after World War II in 1948. The tractor was produced in several variants; The M4 was a 4-wheeled version with the M3 the tricycle (row crop) model, both with a BMC TVO engine or a Petrol engine option (the petrol option models being prefixed with a P on the Manufacturers plate). Later a Diesel was introduced as the Nuffield Universal DM4 or DM3, first with a Perkins engine then with BMC's own Diesel engine (post 1954 starting with s/n DE1001)