Documented failure points and real market prices for the Kenworth T800.
Confidence 0%10 observed comparables
As of Sep 6, 2026What can make the cheap machine expensive?
T800s of the CAT C15/C13 era ran a twin-turbo setup that is sensitive to oil viscosity; wrong oil accelerates turbo bearing failure.
Cost not yet verifiedContaminated fuel destroys the injector set; a full 8-injector replacement is a major repair bill.
Cost not yet verifiedOverheating on the CAT C15/C13 commonly used in T800s can crack heads or warp the block.
Cost not yet verifiedThe EGR valve on these engines gets clogged with soot over time, restricting exhaust recirculation.
Cost not yet verifiedCommon questions
How much does a used Kenworth T800 cost?
Observed listings range roughly $23,500 to $144,950 depending on age, condition, and configuration (as of 2026-09-06).
What fails on the Kenworth T800?
The most cited concerns in our evidence record: turbocharger bearings (CAT C15/C13), fuel injectors (CAT C15/C13), engine overheating (CAT C15/C13). See the risk breakdown above for details and sources.
From the research record
- FAILURE (2026-09-06, agent-fetched, Claude spot-verified sample): turbocharger bearings (CAT C15/C13): "twin-turbo system that needs specific oil viscosity to prevent turbo bearing failure" https://skylinerrepaircenter.com/blog/caterpillar-truck-engines-legacy-maintenance-guide
- FAILURE (2026-09-06, agent-fetched, Claude spot-verified sample): fuel injectors (CAT C15/C13): "Contaminated fuel destroys injectors - a set of eight injectors costs $4,000-$6,000" https://skylinerrepaircenter.com/blog/caterpillar-truck-engines-legacy-maintenance-guide
- FAILURE (2026-09-06, agent-fetched, Claude spot-verified sample): engine overheating (CAT C15/C13): "Overheating a Cat C15 or C13 can crack cylinder heads or warp the block" https://skylinerrepaircenter.com/blog/caterpillar-truck-engines-legacy-maintenance-guide
- FAILURE (2026-09-06, agent-fetched, Claude spot-verified sample): EGR valve clogging (CAT C15/C13): "The EGR valve recirculates exhaust gases and gets clogged with soot" https://skylinerrepaircenter.com/blog/caterpillar-truck-engines-legacy-maintenance-guide
- MARKET (10 real listings, 2026-09-06): low $23,500 / median $64,973 / high $144,950. 10 real listings (2006-2020, 98k-601k mi), 6 dealers; Claude-refetched the page and confirmed exact price matches. Wide spread is real: vocational configs and CAT-era classics command premiums.
Sources
- skylinerrepaircenter.com (failure evidence)repair-industry · verified · accessed 2026-09-06
- soarr.com dealer inventory (10 real listings, Claude-refetched)dealer-inventory-aggregator · verified · accessed 2026-09-06