K&N Heavy Duty Air Filter Cleaner and Degreaser - 1 Gallon

In this review of the K&N Heavy Duty Air Filter Cleaner and Degreaser, Power Kleen, the bottom line is simple: this is a purpose-built cleaner for oiled heavy duty diesel K&N air filters that restores airflow and removes oil and grime more effectively than generic cleaners. For fleet owners, diesel truck operators, and anyone with reusable K&N cotton media filters, the single biggest reason to buy is that Power Kleen is the only cleaner recommended for K&N cotton filters and is formulated to dissolve old oil and filter build-up so the media can be rinsed clean.

Key Features

• Cleans oiled heavy duty filters: Formulated specifically to clean oiled K&N heavy duty diesel air filters without using harsh solvents that can damage cotton media.
• Powerful degreaser action: The cleaner quickly dissolves filter build-up and old oil so grime can be rinsed away with water, restoring the filter's ability to pass air.
• Restores performance: Regular cleaning with this product helps return airflow efficiency so a K&N filter performs closer to new condition.
• Warranty-safe choice: Using the recommended K&N cleaner avoids risks that could void the filter warranty from improper cleaning solutions.
• Large 1 gallon size: A one gallon container provides convenience and value for users who service multiple filters or perform routine maintenance on fleets.

Who It's For

This cleaner is best for owners of K&N oiled cotton media air filters, particularly diesel truck operators, agricultural equipment owners, or repair shops that maintain multiple heavy duty filters. Its formulation is aimed at restoring clogged, oily filters by dissolving old oil and embedded dirt so the media can be rinsed clean.

It is not intended for polished or anodized aluminum surfaces and should not be used as a general-purpose degreaser for components other than K&N cotton media filters. Users who need a spray applicator out of the box or who primarily clean foam or disposable paper filters should consider other specialty cleaners.

Pros & Cons

Pros

• Effective at cutting through oil and grime, restoring airflow to reusable K&N cotton media filters.
• Large one gallon container offers good value and is convenient for multiple filter cleanings.
• Recommended by the filter maker, which helps protect the warranty and reduces risk of media damage.

Cons

• Some customers report the product is sold without a spray nozzle, which can make application less convenient.
• Not suitable for polished or anodized aluminum, limiting where it can be used around an engine bay.

Specifications

Product	K&N Power Kleen Heavy Duty Air Filter Cleaner
Volume	1 gallon
Intended filter type	Oiled heavy duty diesel K&N cotton media filters
Main function	Degreaser and filter cleaner that dissolves oil and build-up
Compatibility notes	Only recommended for K&N cotton media; do not use on polished or anodized aluminum
Warranty note	Use of other cleaning solutions can void filter warranty

Our Verdict

Power Kleen 1 gallon is a practical, effective choice for anyone who needs to maintain multiple oiled K&N heavy duty filters and wants to restore airflow without risking filter media damage. It delivers strong degreasing performance and value, though buyers should be aware it may arrive without a spray nozzle and should not be used on polished aluminum surfaces.

Frequently Asked Questions

Can I use this cleaner on any K&N filter?
Answer. It is formulated for oiled K&N cotton media heavy duty diesel filters; do not use it on filters that are not oiled cotton media or on polished/anodized aluminum parts.

Will this product void my filter warranty?
Answer. This is the K&N recommended cleaner, so using it protects against warranty issues related to using improper cleaning solutions.

Does the bottle include a spray nozzle?
Answer. Many customers note the gallon container is sold without a spray nozzle, so plan to transfer to a sprayer or use a separate applicator for ease of use.