The Barreiros 4000 is a farm tractor produced by Barreiros from 1968 to 1974. It features a Barreiros A45 2.5L 3-cylinder liquid-cooled diesel engine producing 40 hp (29.8 kW). The tractor has a 10-speed transmission with 10 forward and 2 reverse gears. It is a two-wheel drive tractor with an open operator station and weighs approximately 4,300 lbs (1950 kg).