Kenworth · Class 8 on-highway tractor
Kenworth T680PACCAR MX-13, 12.9 L (MX-11 10.8 L and Cummins X15 optional)
Built 2013-2026
Engine PACCAR MX-13, 12.9 L (MX-11 10.8 L and Cummins X15 optional)
Sources checked 119 of 137 (87%)
What it is
Kenworth's aerodynamic long-haul tractor. Usually ordered with the in-house PACCAR MX-13 engine and a PACCAR automated transmission.
Pick a folder
Fluids & Fill Amounts8 entriesBolt Tightness53 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 162 mm
Dry weight
2,500 lb (1,134 kg)
Horsepower
405-510 hp
Peak torque
1,550-1,850 lb-ft
Governed speed
2,100 rpm
B10 design life
1.0 million miles
Max operating weight
140,000 lb
Transmission
PACCAR TX-12 / TX-18 automated, or Eaton Fuller 10/13/18-speed manual
Front axle
Dana / Meritor 12k-13.2k
Rear axle
PACCAR / Meritor / Dana 40k tandem
Weight class
Class 8 - 40,000 lb tandem rear
Before you order anything
Options change the numbers
Spec levels vary widely by order. Most common build is the MX-13 with a PACCAR 12-speed automated transmission.