Choose the Peterbilt 579 for OTR driver comfort — its 76" sleeper options exceed the Western Star 57X's 72" maximum. The Peterbilt 579 offers more peak power (605 hp vs 600 hp), giving it an edge for heavy-haul and mountainous routes.
| Spec | Peterbilt 579 1053 available · from $19,495 | Western Star 57X 255 available · from $19,500 |
|---|---|---|
| Engine Options | ||
| Engine options | PACCAR MX-13, PACCAR MX-11, Cummins X15 | Detroit DD16, Detroit DD13 Gen 5, Detroit DD15 Gen 5 |
| Horsepower range | 370–605 hp | 370–600 hp |
| Peak torque | 2,050 lb-ft | 2,050 lb-ft |
| Weight Ratings | ||
| GVWR (max) | 80,000 lbs | — |
| GCWR | 220,000 lbs | — |
| Transmission Options | ||
| Transmissions | PACCAR Automated 12-speed (TX-12), Eaton Fuller 10-speed, Allison 4700 RDS | Detroit DT12 Direct and Overdrive AMT |
| Dimensions | ||
| Wheelbase options | 7 options (210"–280") | 0 options (undefined"–undefined") |
Choose the Peterbilt 579 for OTR driver comfort — its 76" sleeper options exceed the Western Star 57X's 72" maximum. The Peterbilt 579 offers more peak power (605 hp vs 600 hp), giving it an edge for heavy-haul and mountainous routes.
Both the Peterbilt 579 and Western Star 57X hold strong resale value among owner-operators and fleets. Resale depends heavily on mileage, maintenance history, and regional demand — not OEM brand alone. Check current listings on TruckRadar for real-world asking prices.
No. The Peterbilt 579 is built by Peterbilt and the Western Star 57X is built by Western Star. Both are Class 8 conventional tractors but differ in powertrain options, cab dimensions, dealer networks, and MSRP.
The Peterbilt 579 tops out at 605 hp / 2050 lb-ft torque. The Western Star 57X tops out at 600 hp / 2050 lb-ft. GVWR is 80,000 lbs for the Peterbilt 579 and similar lbs for the Western Star 57X.
TruckRadar has 1,308 Peterbilt 579 and Western Star 57X trucks available right now from dealers nationwide. Search by make, model, price, and location at truckradar.ai.
| Sleeper sizes | 40", 52", 72", 76" | 60", 72" |
| Pricing (estimated) |
| Base MSRP range | $135,000–$185,000 | — |