Peterbilt · Class 8 on-highway tractor
Peterbilt Model 579PACCAR MX-13, 12.9 L (MX-11 10.8 L, Cummins X15 optional)
Built 2013-2026
Engine PACCAR MX-13, 12.9 L (MX-11 10.8 L, Cummins X15 optional)
Sources checked 118 of 136 (87%)
What it is
Peterbilt's long-haul tractor, built on the same PACCAR engine and axle package as the Kenworth T680, so the service numbers are close to identical.
Pick a folder
Fluids & Fill Amounts8 entriesBolt Tightness52 entriesWhen to Service13 entriesWarning Lights & Codes30 entriesHow to Fix It79 entries
The truck itself
Configuration
Inline 6, 12.9 L
Bore x stroke
130 x 160 mm
Dry weight
2,500 lb (1,134 kg)
Horsepower
405-510 hp
Peak torque
1,550-1,850 lb-ft
Governed speed
2,200 rpm
B10 design life
1.0 million miles
Max operating weight
140,000 lb (MX-13)
Transmission
PACCAR TX-12 PRO / TX-18 automated, or Eaton Fuller manual
Front axle
PACCAR / Meritor 12k-13.2k
Rear axle
PACCAR DX-40 40k tandem
Weight class
Class 8 - 40,000 lb tandem rear
Before you order anything
Options change the numbers
The New Model 579 (2021+) shares the MX engine and DX-40 axle with the T680. Chassis electrical detail differs, so use the VIN schematic for wiring.