2024 Kenworth T680

Duty cycle profile, 492,852 miles shows steady highway use with the kind of wear you expect on a fleet sleeper that has lived in the fast lane. Mileage at this level puts inspection emphasis on cooling system integrity, aftertreatment health, driveline angles, and any history of parked regens or derates, even if the dash is clean. Powertrain documentation, ECM status is not provided, so verification matters. Engine hours, idle percentage, active and inactive fault history, and aftertreatment counters should be pulled before assigning value, along with a road test to confirm boost response, transmission shift quality, and cruise behavior under load. Serial 1XKYD49X4RJ333053 and stock 0631524 are the identifiers to tie that data to the truck. Frame rails and suspension points are the quick truth tellers on a high-mile sleeper. Look for rubbed airlines, chafed harnessing, shock seepage, bushing play, and any evidence of fifth wheel slap or loose slider hardware. Wheels and tires should be checked for irregular wear that points to alignment drift or worn kingpins, plus brake lining thickness and rotor or drum condition. Cab interior and sleeper hardware show how it was treated day to day. Check seat base play, pedal wear, HVAC performance, bunk and cabinet latches, and any dash warning history tied to ABS, stability, or emissions. Service records, especially for DPF cleaning intervals and coolant, will do more to confirm mechanical reality than cosmetics.