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John Deere Power Systems offers its Interim Tier 4/Stage III B diesel engine lineup. For engines 56 kW (75 hp) and above, John Deere starts with its PowerTech Plus Tier 3/Stage III A in-line, 4- and 6-cylinder engine platform — which includes cooled exhaust gas recirculation (EGR) for NOx control — and adds an exhaust filter for reducing PM. These engines feature full-authority electronic controls, a four-valve cylinder head, a high-pressure fuel system, turbocharging and an air-to-air aftercooling system. Engines between 56 kW (75 hp) and 129 kW (173 hp), are available in 4.5L and 6.8L displacements and are equipped with either a wastegate or variable geometry turbocharger depending upon the size of the engine.