K&N Engine Air Filter review
Buy once, clean it forever
We scored the K&N Engine Air Filter 8 out of 10, which ranks it 3 of 3 in Auto Parts. The lowest in-stock price we track today is $58.00 at Amazon, out of 3 retailers compared below.
Our score out of 10
Best for Owners keeping a vehicle long term
The verdict
A washable filter that pays for itself after about three replacements, with marginal performance benefit.
Pros and cons
What we liked
- Washable and reusable for the life of the car
- Pays for itself after three replacements
- Million mile warranty
What we didn’t
- Performance gains are far smaller than advertised
- Over-oiling can foul the airflow sensor
Our review
The genuine argument for a K&N is that you never buy another air filter. Clean it, re-oil it and refit it, repeating for the life of the vehicle.
The performance gains are far smaller than the marketing implies, and over-oiling after cleaning can foul a mass airflow sensor. Follow the instructions and it is a sound long-term purchase.
Specifications
| Type | Washable cotton gauze |
|---|---|
| Service interval | Clean every 50,000 miles |
| Warranty | Million mile limited |
Score breakdown
Scored on the same four axes as every other product on this site. How we rate
Watch this price
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How far apart K&N Engine Air Filter prices are right now
$7.00, or 12%, separates the cheapest and most expensive in-stock listing we track. It is $58.00 at Amazon and $65.00 at Advance Auto Parts, across 3 retailers last checked on Sep 16, 2026.
- Lowest in stock
- $58.00Amazon
- Highest in stock
- $65.00Advance Auto Parts
- Gap between them
- $7.0012% more at the top
- Retailers in stock
- 3of 3 tracked
Compare prices
3 retailers, cheapest first. Prices checked 5 days ago.
We earn a commission when you buy through links on this page, at no extra cost to you. It never changes our ratings or the order of the prices below.
| Retailer | Details | Price | Go to retailer |
|---|---|---|---|
AmazonBest price Free Prime delivery | Free Prime delivery | $58.00$69.00 | Check price |
CARiD Free shipping over $99 | Free shipping over $99 | $62.00 | Check price |
Advance Auto Parts Free store pickup | Free store pickup | $65.00 | Check price |
Prices and availability are accurate as of the date shown and can change. Always confirm the final price on the retailer’s own site before buying.
