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Peterbilt Motors Company’s Model 389 is available with the Paccar MX engine. The Paccar MX engine provides customers a long term proposition through its technologically advanced designs with lightweight materials that achieve excellent performance and leading fuel economy. The Paccar MX engine is available with a horsepower range of 380hp-485hp and torque outputs up to 1,750 lb-ft with a displacement of 12.9 liters. Using Selective Catalytic Reduction (SCR) in combination with exhaust gas recirculation (EGR), the MX engine meets 2010 EPA diesel engine emissions regulations.