# Kenworth W900: Used-Buy Risk, Repairs & What to Check | Big Rig Risk

> Used Kenworth W900 buying guide, prices $59,950-$209,950, egr cooler risk, repair costs and what to inspect.

**Verdict:** inspect

$59,950–$209,950 observed used across 6 comps, and price tracks mileage — high-mile (455k–655k) trucks land $89k–$175k, low-mile late units $175k–$230k. The W900 shell is sold across many engine specs, so buy on the specific engine (ISX15 / legacy C15) and driveline, not the badge.

**Observed used price:** $59,950–$209,950

**Documented failure risks:**
- Fuel Injectors (Cummins ISX15, common W900 spec): ISX15 injectors fail by sticking open (white smoke, rough idle) or sticking closed (misfires, power loss); commonly spec'd engine in W900 conventional trucks.
- EGR Cooler (Cummins ISX15): EGR cooler cracks internally and mixes coolant with exhaust gas, producing white smoke and coolant loss with no visible external leak.
- Injectors (legacy Caterpillar C15, common older W900 spec): Older W900s were commonly spec'd with Cat C15/C13 engines; HEUI injector sets are expensive to replace and vulnerable to contaminated fuel.
- Transmission synchronizers/shift forks (Eaton Fuller manual, common W900 driveline): Eaton Fuller manuals common in W900 spec sheets develop hard shifting and jump-out-of-gear faults at high mileage.

## Sources
- [skylinerrepaircenter.com (failure evidence)](https://skylinerrepaircenter.com/blog/cummins-isx15-engine-problems-a-mechanic-s-perspective) (accessed 2026-09-05)
- [skylinerrepaircenter.com (failure evidence)](https://skylinerrepaircenter.com/blog/caterpillar-truck-engines-legacy-maintenance-guide) (accessed 2026-09-05)
- [skylinerrepaircenter.com (failure evidence)](https://skylinerrepaircenter.com/blog/eaton-fuller-transmission-problems-and-solutions) (accessed 2026-09-05)
- [soarr.com W900 dealer inventory (auto-refresh watch: publishes when 3+ real used listings appear)](https://www.soarr.com/for-sale/trucks/0/Kenworth/W900/all-for-sale) (accessed 2026-09-05)

_Last verified 2026-09-11. Source: Big Rig Risk — https://bigrigrisk.com/trucks/kenworth-w900/ — every claim checked against a primary source before publication (see /methodology/)._