International LT / ProStar / WorkStar Filters: A26, Cummins ISX / X15

Filters for the brand that built the first International truck in 1907.

International Harvester built its first truck in 1907. The company has changed names three times since then: International Harvester to Navistar International in 1986, Navistar to International Motors in 2024 after the Traton acquisition. The badge on the hood has stayed the same throughout. The LT, the HX, and the ProStar before them carry one of the oldest continuous identities in American trucking, and the engine option list has reflected the same long view. Customers can spec the in-house International A26, the Cummins ISX or X15, or until recently the older International MaxxForce. Most of the trucks Steinberg writes part numbers for are running Cummins.

Steinberg stocks 9 SKUs that fit the most common International configurations (Cummins-powered LT and ProStar): two oil filters (FO004 and FO005 for Cummins X15/ISX15/ISX12), one fuel filter (FF006 for Cummins X15/ISX15 extended service), and two water separators (FF009 extended service for Cummins ISX/X15, FF002 for pre-EGR ISX). For International ProStar/WorkStar/TranStar engine intake air filters, see our Heavy-Duty Air Filters collection. For the International LT625 cabin filter, see our Cabin Air Filters collection. For Cummins B6.7-engine medium-duty International trucks, see our Cummins ISB 6.7 / B6.7 Filters collection.