2025 Peterbilt 579 ISX/ISX15/X15 — Used Market Prices & Trends

The 2025 Peterbilt 579 powered by the ISX/ISX15/X15 is currently represented by 6 active listings on TruckRadar, with a median asking price of $156,204 and median odometer reading of 34,014 miles. Over the past 90 days, asking prices have moved down 23.1%. Seasonal softening in the used truck market tends to occur as fleets delay purchasing decisions during slower freight periods. Most units listed are configured as conventional cab with tandem rear axle (6x4) drivetrains. Geographically, the largest concentrations of 2025 579 inventory sit in Iowa and Ohio, where regional pricing ranges from $156,204 to $182,999. Common transmission pairings include 12 and AMT. The 2025 579 typically appears in dealer inventory for an average of 30 to 60 days before sale, based on TruckRadar listing turnover data. Buyers comparing this configuration often also evaluate the 567 and 589. Pricing reflects active asking prices from verified dealers and is not a substitute for a formal appraisal.

2025 Peterbilt 579 ISX/ISX15/X15 — Frequently Asked Questions