2019 Peterbilt 579 – PACCAR MX-13 | 12-Speed Automatic | 439K Miles The 2019 Peterbilt 579 is a versatile and efficient long-haul truck built with performance, comfort, and reliability in mind. Equipped with the dependable PACCAR MX-13 engine and a smooth 12-speed automatic transmission, this truck is designed to deliver consistent power while maximizing fuel efficiency. With 439k miles, this unit has been road-tested and remains a strong option for continued service. The aerodynamic design helps reduce fuel costs, while the well-appointed interior ensures driver comfort on extended hauls.