K&N Engine Air Filter for Ford Super Duty V8 — 2017–2019 Direct-Fit, 24,000‑Mile Extended-Life

K&N KNF-0644 is an extended-life engine air filter engineered to protect and improve airflow for 2017–2019 Ford Super Duty V8 trucks, with a service interval of up to 24,000 miles.

This K&N Advantage Plus replacement air filter is a direct-fit element designed to meet or exceed OEM performance for Ford F250, F350, F450 and F550 Super Duty models from 2017–2019. Built from a specially treated filter media blend, the KNF-0644 offers longer service life than standard disposable filters while providing high-efficiency particle capture and consistent airflow. It installs into the factory air box in minutes and is engineered to match factory dimensions so you get reliable sealing and fitment without modification.

How does this filter protect my Super Duty engine?

The KNF-0644 uses a premium, specially treated synthetic or cellulose blend media to intercept dust and debris while allowing required airflow. K&N reports up to 99.5% efficiency in particle removal for the applications it serves, reducing abrasive contaminants that cause engine wear.

• Specially treated media captures fine particles while maintaining flow.
• Designed to meet or exceed OEM filtration specifications.
• Seals to the factory air box to prevent unfiltered bypass air.

Will this filter improve performance or fuel economy?

The filter is engineered to balance high filtration efficiency with stable airflow; that can help the engine breathe smoothly under load. While not a power part, it supports consistent combustion by minimizing airflow restriction compared with clogged or heavily soiled disposable filters.

• Engineered media for improved airflow consistency compared to worn filters.
• Supports optimal air/fuel balance for stable throttle response.
• May help maintain fuel economy by preventing airflow restriction over time.

How often must I replace the K&N KNF-0644?

This KNF-0644 cartridge is rated for up to 24,000 miles under normal highway driving conditions — roughly double the life of a typical 12,000-mile disposable filter. Actual replacement interval depends on driving environment; dusty or off-road use may require more frequent changes.

• Standard guideline: replace every 24,000 miles under normal highway driving.
• Inspect more often in dusty, towing, or severe duty conditions.
• Simple swap-in replacement that takes minutes in the factory air box.

Is this filter compatible with my 2017–2019 Ford Super Duty?

The KNF-0644 is specified for V8-equipped Ford Super Duty trucks in the 2017–2019 model years, including F250, F350, F450 and F550. It is produced to match OEM fitment so installation is straightforward and no modification is required.

• Direct-fit for 2017–2019 Ford F250, F350, F450, F550 with compatible V8 air boxes.
• Manufactured to meet OEM dimensions and installation points.
• Quick replacement process: remove the old cartridge and seat the KNF-0644 in the factory housing.

Who is this for? The K&N KNF-0644 is best for Ford Super Duty owners who want a long-life, OEM-fit replacement air filter that prioritizes engine protection and consistent airflow. If you drive mostly on highways and want fewer service intervals, or if you need a dependable direct-fit filter that installs quickly and meets OEM specs, this part offers a practical balance of filtration efficiency and extended life. For heavier off-road, dusty, or commercial duty cycles, plan for more frequent inspections and replacements based on conditions.