PACCAR Remanufactured Engines
MX-13, MX-11, PX-9, PX-7 & More
US Engine Production offers premium remanufactured PACCAR engines for Kenworth and Peterbilt trucks. From the flagship MX-13 to the versatile PX-series, every engine is rebuilt to PACCAR's exacting standards with comprehensive testing and warranty coverage.
PACCAR Engine Specifications
| Engine | Displacement | Config | Horsepower | Torque | Applications |
|---|---|---|---|---|---|
| MX-13 | 12.9L | I6 | 380-510 hp | 1,450-1,850 lb-ft | Kenworth T680, Peterbilt 579 |
| MX-11 | 10.8L | I6 | 330-430 hp | 1,150-1,550 lb-ft | Kenworth T880, Peterbilt 567 |
| PX-9 | 8.9L | I6 | 260-380 hp | 660-1,150 lb-ft | Kenworth T270/T370, Peterbilt 536/537 |
| PX-7 | 6.7L | I6 | 200-325 hp | 520-750 lb-ft | Kenworth K270, Peterbilt 536 |
About PACCAR Engines
PACCAR Inc., the parent company of Kenworth and Peterbilt, began producing its own engines in 2010 with the MX-13, ending decades of reliance on third-party engine suppliers. The PACCAR MX engine platform was developed in collaboration with DAF Trucks (also a PACCAR subsidiary) and quickly earned a reputation for fuel efficiency, reliability, and low total cost of ownership.
PACCAR's decision to develop their own engines was a strategic move to control the entire powertrain in their Kenworth and Peterbilt trucks. The MX-13 (12.9L) was developed with DAF Trucks in the Netherlands and quickly became one of the most fuel-efficient Class 8 engines available. The MX-11 (10.8L) brought PACCAR power to vocational and regional applications, while the PX-7 (6.7L) and PX-9 (8.9L) — based on Cummins B and L series respectively — serve the medium-duty market. PACCAR engines are known for their long oil change intervals (up to 75,000 miles), low maintenance costs, and excellent fuel economy.
PACCAR Engine Buying Guide
When purchasing a remanufactured PACCAR engine, the engine serial number identifies the exact configuration including emissions certification year and horsepower rating. The MX-13 has evolved through multiple emissions tiers (EPA 2010, 2013, 2017, 2021), so matching the correct certification is essential for compliance.