Decision dossierEvidence reviewed
Cummins ISX15 · International ProStar

International ProStar Used Price & Common Problems

International ProStar: used $16,950 to $70,904. Documented problems: possible ISX rebuild and oil pan leak. What to inspect before you buy.

Status: published
Used range$16,950–$70,904
RecallON RECORD
Known risks4
Sources10
Verified2026-09-11
Safety notice

Recall on record for this model family

  • NHTSA 18V588000 — ENGINE AND ENGINE COOLING:ENGINE:DIESEL NHTSA recall: official notice
  • NHTSA 08V618000 — SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS NHTSA recall: official notice

Verify the unit's serial number against the official notice before purchase.

Buy-Risk Verdict
Inspect before buying · moderate confidence
Short answer: Used International ProStar: $16,950–$70,904 observed used across 15 listings. The documented cost risk to price in: a possible full ISX rebuild and an active oil pan leak. Buy only after inspection. Used examples run $16,950 to $70,904. Basis: youtube.com.

Last verified against the primary source on Sep 11, 2026.

Decision status
inspect

Used International ProStar: $16,950–$70,904 observed used across 15 listings. The documented cost risk to price in: a possible full ISX rebuild and an active oil pan leak. Buy only after inspection.

Confidence 55%
Market context
$25,000

15 observed comparables

As of Sep 5, 2026
Next-150k-Mile Exposure

What can make the cheap machine expensive?

ComponentSeverityDocumented repair cost
Possible ISX rebuildhighnot yet verified
Oil pan leakhighnot yet verified
VGT turbo foulingmediumnot yet verified
Possible ISX rebuildhigh

An owner weighing a full ISX rebuild describes the motor as not yet showing major…

Cost not yet verified
Oil pan leakhigh

The same truck has an active oil pan leak ahead of the rebuild decision.

Cost not yet verified
Injectors run about $1,000 each; a relief valve was flagged medium

Injectors run about $1,000 each; a relief valve was flagged as a likely leak point…

Cost not yet verified
VGT turbo foulingmedium

Engine-family sources (shared platform, applies regardless of chassis brand): VGT turbo…

Cost not yet verified
Navistar, Inc. (Navistar) is recalling certain 2017-2018 International ProStar and 9900i trucks, 2018-2019 International LT trucks, 2017-2019 International LoneStar and HX trucks and 2017 International PayStar trucks, equipped with Cummins ISX15 or X15 diesel engines. In certain driving conditions, such as on a long down-hill grade, the fuel line may burst if the fuel pump cooling circuit screen becomes restricted.
— NHTSA recall 18V588000 (ENGINE AND ENGINE COOLING:ENGINE:DIESEL), accessed 2026-09-11

Common questions

How much does a used International ProStar cost?

Observed listings range roughly $16,950 to $70,904 depending on age, condition, and configuration (as of 2026-09-05).

What fails on the International ProStar?

The most cited concerns in our evidence record: Possible ISX rebuild, Oil pan leak, VGT turbo fouling. See the risk breakdown above for details and sources.

Is the International ProStar under recall?

A safety recall exists for this model family. Verify the unit's serial number against the official notice linked on this page before buying.

From the research record

  • FAILURES: - An owner weighing a full ISX rebuild describes the motor as not yet showing major issues, but flags "right around 800,000 miles" as when this class of rebuild decision becomes live: "we're not having any major issues with the motor... yet, a lot of guys are telling me [wait]" (video transcript: https://www.youtube.com/watch?v=kP3vMQJaAFI @ 00:00:
  • REPAIR: - Full rebuild quote: the owner's stated threshold to commit is "somewhere in the mid 20s to low 20s" — i.e., roughly $20,000-$25,000 (video transcript: https://www.youtube.com/watch?v=kP3vMQJaAFI @ 00:02:23-00:02:33). - The "classic" rebuild tier being quoted covers the water pump and "everything but the turbo" (video transcript: same @ 00:00:43-0
  • LIFE: - Documented service life of 500,000+ miles achievable; fuel economy 7-10 MPG typical; base warranty 2yr/250,000mi, extended 5yr/500,000mi. https://www.cylinder-heads.com/cummins-isx/ - Owner testimony above suggests some operators push well past 500
  • VIDEO (00:00:58 https://www.youtube.com/watch?v=CrDuDh0DsbM): "thing. And luckily for me, it's a relief valve cuz injectors are about $1,000 a"
  • VIDEO (00:01:00 https://www.youtube.com/watch?v=CrDuDh0DsbM): "valve cuz injectors are about $1,000 a"
  • VIDEO (00:01:00 https://www.youtube.com/watch?v=CrDuDh0DsbM): "valve cuz injectors are about $1,000 a piece. So, we're starting it. And uh"
  • MARKET (soarr.com dealer inventory, 15 listings observed 2026-09-05): low $16,950 / median $25,000 / high $70,904. Claude-refetched: 15 used International ProStar listings (2010-2018, 162k-576k mi), $16,950-$70,904, median $25,000.
  • RECALL (18V588000, ENGINE AND ENGINE COOLING:ENGINE:DIESEL): Navistar, Inc. (Navistar) is recalling certain 2017-2018 International ProStar and 9900i trucks, 2018-2019 International LT trucks, 2017-2019 International LoneStar and HX trucks and 2017 International PayStar trucks, equipped with Cummins ISX15 or X15 diesel engines. In certain driving conditio...
  • RECALL (08V618000, SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS): NAVISTAR IS RECALLING 14,048 MY 2008-2010 LONESTAR AND PROSTAR TRUCKS. THE SERVICE BRAKE AIR LINE THAT RUNS FROM THE TRACTOR PROTECTION VALVE TO THE FAST BRAKE MODULE MAY SEPARATE FROM THE FAST BRAKE MODULE RESULTING IN LOSS OF TRAILER SERVICE BRAKES.

Sources

  1. youtube.comweb · research-cited · accessed 2026-08-19
  2. youtube.comweb · research-cited · accessed 2026-08-19
  3. dieselpro.comweb · research-cited · accessed 2026-08-19
  4. 4btengines.comweb · research-cited · accessed 2026-08-19
  5. cylinder-heads.comweb · research-cited · accessed 2026-08-19
  6. dieselrebuildkits.comweb · research-cited · accessed 2026-08-19
  7. How to CHECK FAULT CODEs on INTERNATIONAL PROSTARvideo-transcript · research-cited · accessed 2026-08-19
  8. soarr.com dealer inventory listings (15 real listings observed 2026-09-05)dealer-inventory-aggregator · verified · accessed 2026-09-05
  9. NHTSA recall 18V588000 (ENGINE AND ENGINE COOLING:ENGINE:DIESEL)nhtsa-recall · verified-primary · accessed 2026-09-11
  10. NHTSA recall 08V618000 (SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS)nhtsa-recall · verified-primary · accessed 2026-09-11
Spot an error? Challenge this record

Found an out-of-date code section, a wrong verdict, or a better primary source? Tell us. Corrections that check out are applied, with the change shown in history. That is our standing policy.

Related records

More in International

All International records →