Buyer Research

2018 International LoneStar A26 — Should You Buy One?

Typical asking price: $60,000–$88,000. There are 3 high-severity known issues you need to know before handing over a check.

Kestrel Take

The International LoneStar with the A26 engine is a good-looking truck with a controversial reliability history. The A26 is International's own medium-bore engine and has improved significantly since early builds, but it does not have the long-haul pedigree of the Cummins X15 or Detroit DD15 yet. Buy with thorough due diligence.

Known Issues for the 2018 International LoneStar A26

Ranked by wallet impact. These are documented, recurring problems — not freak accidents.

A26 fuel injector and high-pressure fuel pumpHigh — wallet impact

Early A26 builds had injector and HPFP issues causing rough running, hard starts, and high fuel consumption. Improvements were made through the model run. Verify no injector history on the ECM.

Repair cost range: $2,000-$6,000

EGR system foulingHigh — wallet impact

EGR deposits accumulate faster on the A26 than on competing engines. Regular EGR cleaning intervals are documented in owner communities.

Repair cost range: $500-$2,500

Aftertreatment fault codesHigh — wallet impact

DEF, DPF, and SCR system faults trigger derate. Pre-purchase diagnostic scan is essential on any modern International.

Repair cost range: $500-$4,000

Diamond Logic electrical gremlinsMedium

International's Diamond Logic electrical system has documented fault code and communication errors that can disable features or trigger false warnings.

Repair cost range: $200-$1,500

Walk-Away Red Flags

✗Active fault codes — especially engine or emissions codes
✗A26 with documented injector or HPFP work — ask what and when
✗Any electrical system faults on the Diamond Logic system
✗Coolant consumption without external leak

Good Signs

✓Dealer service records showing EGR cleaning at proper intervals
✓ECM scan returning zero active faults
✓A26 with recent injector service documented
✓Long-haul miles — better for the emissions systems than regional

Found a specific International LoneStar A26?

This page covers what goes wrong on the 2018 International LoneStar A26 in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.

Get My Verdict — $7.99

No account required. Delivered to your inbox, usually within minutes.

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.