AF26657 Primary Engine Air Filter for Peterbilt & Freightliner Trucks
AF26657 primary air filter for Peterbilt 357-389 & Freightliner FL80/Argosy trucks. Replaces older AF25219. Cross reference RS3516, LAF2536. Direct.
Description
The AF26657 engine air filter is the current primary radial seal air filter used across Peterbilt 357, 385, 386, 387 and Freightliner FL80/Argosy trucks, superseding the earlier Fleetguard AF25219. It captures dust, dirt and airborne debris before it reaches the turbocharger, protecting engine performance and fuel efficiency. IXIN Filter manufactures this filter to OEM-equivalent specifications, giving fleets and dealers a reliable, factory-direct alternative for scheduled air filter replacement.
As an IATF 16949-certified filter manufacturer, IXIN supplies the AF26657 engine air filter to distributors, fleet operators and service centers in 60+ countries, with consistent batch quality and full traceability for bulk and OEM orders.
Product Specifications
| Attribute | Detail |
|---|---|
| Product Type | Primary Radial Seal Engine Air Filter |
| Overall Length/Height | 23.2–23.51 in (589–597 mm) |
| Largest Outer Diameter | 9.2–9.45 in (234–240 mm) |
| Bottom Inner Diameter | 5.85–5.98 in (149–152 mm) |
| Certification | IATF 16949 |
Compatible Vehicles
- Peterbilt 357, 377, 378, 379, 382, 384, 385, 386, 387, 388, 389
- Freightliner Argosy, FL80, FLA, FLB
- International 9600, 9700, 9800 SBA
Note: This filter platform is also broadly cross-referenced for a wider range of trucks including International ProStar, Kenworth T370/T680/T800, Mack MR600, Peterbilt 365/579/587, and Volvo VNL Gen II. Confirm your truck’s exact model and year against the OE part number before ordering.
AF26657 Cross Reference / OE Replacement Numbers
The AF26657 engine air filter is a direct cross reference and replacement for the following OE and aftermarket part numbers:
| Brand / Source | Part Number |
|---|---|
| Fleetguard/Cummins Filtration | AF26657 |
| Fleetguard (superseded, older number) | AF25219 |
| Fleetguard (alt.) | AF25525 / EAF5106 |
| Freightliner OE | EAF5106 |
| International/Navistar OE | 1698941C1 / 2039733C1 / 3507421C1 |
| Baldwin | RS3516 |
| Donaldson | P531026 / P534096 / P535788 |
| Luber-finer | LAF2536 |
| WIX | 46842 |
Note: AF26657 is the current Fleetguard part number, superseding the older AF25219. If your parts manual or old filter is still labeled AF25219, AF26657 is the correct current replacement.
Why Choose IXIN’s AF26657 Engine Air Filter
- Current, Up-to-Date Part Number — Manufactured to the latest Fleetguard specification, ensuring you’re supplying the currently active part number rather than a superseded one.
- Reliable Engine Protection — Radial seal design captures dust, dirt and airborne debris, protecting the turbocharger and cylinders from abrasive intake contamination.
- Broad Model Coverage — Fits a wide range of Peterbilt and Freightliner trucks, useful for dealers standardizing air filter inventory.
- OEM-Equivalent Fit — Manufactured to match OE dimensions for the AF26657, ensuring drop-in compatibility.
- Factory-Direct Supply — As a manufacturer (not a trading company), IXIN offers stable lead times and customization options for private label, packaging and media specification. For guidance on verifying cross reference numbers and superseded part numbers before a bulk order, see our fuel filter cross reference guide — the same verification principles apply to air filters.
Installation & Maintenance Notes
For Peterbilt and Freightliner trucks using the AF26657 air filter, general service steps include:
- Shut down the engine and allow the air intake system to cool before servicing.
- Open the air filter housing and remove the old primary element.
- Inspect the housing for dust buildup or debris before installing the new element.
- Install the new filter, ensuring the radial seal seats evenly to prevent unfiltered air bypass, and secure the housing cover.
- Recommended replacement interval: every 5,000–12,000 miles, or sooner if a restriction indicator signals reduced airflow.
FAQ
Q: What’s the difference between AF26657 and the older AF25219? A: AF26657 is the current Fleetguard part number that has superseded AF25219. The two are interchangeable equivalents of the same filter design — if your parts manual references AF25219, AF26657 is the correct current replacement to order.
Q: Is the AF26657 compatible with all the listed Peterbilt and Freightliner models? A: The AF26657 fits a broad range of Peterbilt 357-389 and Freightliner Argosy/FL80/FLA/FLB models across multiple years. Confirm your truck’s exact model and year against the OE part number before ordering.
Q: What’s the difference between IXIN’s AF26657 and the OEM Fleetguard filter? A: IXIN manufactures this filter to match OEM dimensions and the radial seal design. The main difference is price and lead time — IXIN offers factory-direct pricing for bulk and OEM orders without compromising fit or filtration performance.
Q: Can I order the AF26657 with custom packaging or private label? A: Yes. IXIN supports customized packaging, labeling and media specifications for distributors and private-label buyers. Contact our sales team with your requirements.
Q: What is the minimum order quantity (MOQ)? A: MOQ varies by customization level. Get in touch with us via WhatsApp or email for current MOQ and lead time on the AF26657 engine air filter.
