K&N Engine Air Filter — 18,000-Mile Replacement (KNA-2456), Long-Life OEM-Fit

K&N Engine Air Filter KNA-2456 is a long-life replacement air filter engineered to deliver extended service life and high filtration efficiency for compatible Infiniti and Nissan SUVs and trucks. K&N has built a reputation for high-flow performance filtration since 1969; the KNA-2456 brings that heritage into a convenient 18,000-mile replacement option for everyday drivers. This filter uses a premium synthetic or cellulose-blend media (depending on the application) to balance airflow and protection, installs quickly into the factory air box, and is designed to meet or exceed OEM fit and function so you can return the vehicle to service in minutes.

How does this filter improve routine maintenance for busy owners?

By extending the recommended replacement interval to 18,000 miles, the KNA-2456 reduces how often you need to open the airbox, saving time and lowering the frequency of part purchases. This longer service life is especially useful for drivers who cover highway miles and want predictable maintenance intervals.

• Rated for up to 18,000 miles between replacements under normal highway use
• Up to 50% longer service life versus standard 12,000-mile disposable filters
• Direct-fit design drops into the factory air box—typically no tools required

What level of engine protection and airflow can I expect?

The filter media is formulated to trap a high percentage of airborne particulates while allowing adequate airflow for responsive engine operation. Depending on the specific application K&N uses premium synthetic or cellulose-blend media engineered to deliver filtration performance that supports engine longevity without severely restricting flow.

• Filter media delivers up to 99% particulate capture to help protect engine components
• Balanced construction maintains needed airflow for combustion efficiency
• Built with durable materials to hold shape and performance over the service interval

Will this fit my vehicle and how easy is installation?

The KNA-2456 is designed for direct replacement in listed factory air boxes to ensure correct fit and sealing. K&N designs their Advantage Plus filters to meet or exceed OEM specifications, so installation is typically straightforward and quick for anyone familiar with basic underhood access.

• Compatible with multiple Infiniti and Nissan full-size SUVs and trucks
• Installs into the factory air box—usually no special tools needed
• Manufactured to OEM-sized dimensions for correct sealing and fit

How durable is the construction and what materials are used?

K&N builds this Advantage Plus filter with rugged materials and an engineered filter element to resist deformation and maintain performance for the full service interval. The combination of heavy-duty framing and premium media helps the filter keep shape and filtration efficiency over many miles of use.

• Rugged construction resists wear and maintains sealing integrity
• Premium synthetic or cellulose-blend media selected by application for performance
• Designed to meet or exceed OEM filtration and fit requirements

Who is this for This K&N KNA-2456 suits owners of compatible large SUVs and trucks—drivers who want a proven, longer-life replacement that reduces maintenance frequency while preserving engine protection and airflow. It’s ideal for commuters and highway drivers who value a direct-fit, easy-install filter designed by a longstanding filtration brand.

FAQ

Q: How often should I replace the K&N KNA-2456?

A: Replace every 18,000 miles under normal highway driving conditions, about 1.5 years for typical annual mileage.

Q: Will this filter require tools to install?

A: In most applications the KNA-2456 drops into the factory air box and installs without tools.