Documented failure points and real market prices for the Kenworth W990, sourced and dated.
Confidence 0%5 observed comparables
As of Sep 5, 2026What can make the cheap machine expensive?
EGR valves and coolers on the PACCAR MX-13 (the W990's engine) operate in a high-soot environment; soot and carbon buildup over time restricts flow.
Cost not yet verifiedClass-action lawsuit alleges MX-13 fuel injectors clog after minimal use regardless of maintenance, causing power loss and potential total engine failure.
Cost not yet verifiedMX-13 turbocharger failures cluster in a predictable high-mileage window.
Cost not yet verifiedCommon questions
How much does a used Kenworth W990 cost?
Observed listings range roughly $79,950 to $154,950 depending on age, condition, and configuration (as of 2026-09-05).
What fails on the Kenworth W990?
The most cited concerns in our evidence record: EGR valve/cooler, fuel injectors, turbocharger. See the risk breakdown above for details and sources.
From the research record
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): EGR valve/cooler: "EGR valves and EGR coolers operate in a high-soot environment. Over time, soot and carbon buildup can restrict flow." https://highwayandheavyparts.com/blog/paccar-mx13-common-engine-issues/
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): fuel injectors: "The fuel injectors utilized in the MX-13 engine often clog after minimal use and preventative maintenance is of little, if any, help." https://www.classaction.org/news/mx-13-diesel-engine-in-certain-kenworth-peterbilt-trucks-plagued-by-fuel-injector-defect-lawsuit-says
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): turbocharger: "Turbocharger failures occur most frequently between 400,000-600,000 miles." https://www.skylinerrepaircenter.com/blog/paccar-mx-13-engine-reliability-and-maintenance-guide/
- MARKET (5 listings observed 2026-09-05): low $79,950 / median $95,990 / high $154,950. Claude-refetched: 5 real used listings (2020-2025, 103k-427k mi) after excluding ~9 brand-new 2026/2027 MSRP units and Request-Price rows on the same page. $79,950-$154,950, median $95,990.
Sources
- highwayandheavyparts.com (failure evidence)repair-industry · verified · accessed 2026-09-05
- classaction.org (failure evidence)repair-industry · verified · accessed 2026-09-05
- skylinerrepaircenter.com (failure evidence)repair-industry · verified · accessed 2026-09-05
- soarr.com dealer inventory (5 listings observed 2026-09-05)dealer-inventory-aggregator · verified · accessed 2026-09-05