2018 Kenworth W900 Cummins X15 — Should You Buy One?
Typical asking price: $95,000–$145,000. There are 2 high-severity known issues you need to know before handing over a check.
Kestrel Take
The W900 is an icon — the long-nose conventional that every trucker pictures when they dream of owning their rig. Cummins X15 power and exceptionally durable build quality. Commands a premium on the used market. Maintenance history and mileage are the whole story; the truck itself is mechanically excellent when serviced.
What we checked
Not checked against public records
No federal database covers this category in a form we can match to a single year and model. What follows is our own write-up, and it has not been reconciled against an official record. Treat it as a starting point, not a verdict.
Known Issues for the 2018 Kenworth W900 Cummins X15
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
Same DEF/DPF/SCR system as every X15. Pre-purchase ECM scan is mandatory — no exceptions.
Repair cost (estimate): $500-$5,000
Source: not yet checked against public records.
Injectors wear at high mileage. Rough idle and increased fuel consumption are the early signs.
Repair cost (estimate): $4,000-$9,000 for a full set
Source: not yet checked against public records.
W900s in northern salt states develop rust at the cab corners and door bottoms. Cosmetic on newer units, structural if ignored for years.
Repair cost (estimate): $500-$3,000 depending on severity
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗Active fault codes on ECM scan
- ✗Rough idle or black smoke — injector wear
- ✗Rust at cab corners or door bottoms on a northern-state truck
Good Signs
- ✓One-owner owner-operator truck with documented PMs
- ✓Injector service documented if over 500k miles
- ✓Southern or western US truck — minimal rust exposure
- ✓ECM scan clean
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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