Peterbilt · Class 8 conventional tractor
Peterbilt Model 389Cummins X15, 15.0 L (PACCAR MX-13 optional)
Built 2007-2025
Engine Cummins X15, 15.0 L (PACCAR MX-13 optional)
Sources checked 119 of 135 (88%)
What it is
Peterbilt's long-nose classic, the traditional counterpart to the Kenworth W900. The same Cummins X15 service data applies.
Pick a folder
Fluids & Fill Amounts7 entriesBolt Tightness52 entriesWhen to Service13 entriesWarning Lights & Codes30 entriesHow to Fix It79 entries
The truck itself
Configuration
Inline 6, 15.0 L (X15)
Horsepower
400-605 hp
Peak torque
1,450-2,050 lb-ft
Fuel system
XPI common rail
Aftertreatment
Single module DPF and SCR
Oil filter
Fleetguard LF14001NN preferred
Transmission
Eaton Fuller 10/13/18-speed manual or automated
Front axle
Dana / Meritor 12k-14.6k
Rear axle
Meritor / Dana 40k-46k tandem
Weight class
Class 8 - 40,000-46,000 lb tandem rear
Before you order anything
Options change the numbers
The 389 wound down production in the mid-2020s and was replaced in the lineup by the Model 589. Check the build year before ordering body parts.