Documented failure points and real market prices for the Western Star 4700, sourced and dated.
Confidence 0%5 observed comparables
As of Sep 5, 2026What can make the cheap machine expensive?
EGR cooler cracking on the Detroit engine family commonly spec'd in the Western Star 4700 lets coolant leak into the exhaust.
Cost not yet verifiedVGT actuator failure on the Detroit engine family causes oil leaks and black smoke under load.
Cost not yet verifiedWestern Star air ride suspension requires more frequent adjustment than owners expect, with front air bags needing replacement by 200k-300k miles.
Cost not yet verifiedSCR system malfunctions on the Detroit engine family trigger derate mode when DEF injectors clog or NOx sensors fail.
Cost not yet verifiedCommon questions
How much does a used Western Star 4700 cost?
Observed listings range roughly $42,500 to $179,900 depending on age, condition, and configuration (as of 2026-09-05).
What fails on the Western Star 4700?
The most cited concerns in our evidence record: EGR cooler (Detroit DD13 engine, a common 4700 spec), variable geometry turbocharger, air ride suspension. See the risk breakdown above for details and sources.
From the research record
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): EGR cooler (Detroit DD13 engine, a common 4700 spec): "The cooler cracks internally, allowing coolant to mix with exhaust gases. You'll notice white smoke from the exhaust and coolant loss without visible leaks." https://www.skylinerrepaircenter.com/blog/detroit-dd15-engine-known-issues-and-maintenance-tips
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): variable geometry turbocharger: "Oil leaks around the turbo housing. The variable geometry turbo (VGT) actuator fails frequently, causing poor acceleration and black smoke." https://www.skylinerrepaircenter.com/blog/detroit-dd15-engine-known-issues-and-maintenance-tips
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): air ride suspension: "Air ride needs adjustment more often than my old truck, but the ride quality is worth it." https://www.skylinerrepaircenter.com/blog/western-star-49x-what-owners-say-about-reliability
- FAILURE (2026-09-05, agent-fetched, Claude spot-verified sample): SCR / DEF system: "The DEF injector clogs, the SCR catalyst deteriorates, or the NOx sensors fail" https://www.skylinerrepaircenter.com/blog/detroit-dd15-engine-known-issues-and-maintenance-tips
- MARKET (5 real listings, 2026-09-05): low $42,500 / median $149,900 / high $179,900. Agent-sourced: 5 real listings from 5 different dealers (2016-2022, 108k-385k mi). $42,500-$179,900, median $149,900; the low end is an older, higher-mileage unit, the cluster near $150-180k are newer lower-mileage vocational trucks.
Sources
- skylinerrepaircenter.com (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 real listings)dealer-inventory-aggregator · verified · accessed 2026-09-05