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Product guide

K&N 33-3131 Washable Engine Air Filter

K&N 33-3131 is a washable, reusable replacement engine air filter listed for select Ford and Lincoln vehicles. Its four-layer cotton-gauze media and drop-in design may appeal to owners who prefer cleaning and reusing a filter, but exact vehicle fitment is the key buying check.

At a glance

Reusable filter with four layers of treated cotton-gauze media, according to the listing.
Pre-treated design is described as ready to drop into the factory air box.
The maker recommends cleaning every 75,000 miles under normal highway driving conditions, based on 15,000 miles driven per year.
Listing describes a limited lifetime warranty for stock replacement filters, with limitations applying.

Price

$55.19Save 20%

Reference price: ~~$68.99~~

Price checked: Nov 14, 2026

View offer

Often bought together

K&N LIFETIME Cabin Air Filter: Washable, Clean Air for your Cabin, VF3021 | Compatible with 2014-2026 Ford/Lincoln: Bronco, Escape, Explorer, Mustang Mach-E, Aviator, Corsair

$38.39

K&N Air Filter Cleaning Kit: Aerosol Filter Cleaner and Oil Kit; Restores Engine Air Filter Performance; Service Kit-99-5000, Multi

$23.99

Pros and cons

Pros

Washable and reusable design can reduce reliance on disposable replacement filters.
Drop-in installation is intended for the factory air box, without describing a separate modification.
The stated cleaning interval gives highway drivers a useful maintenance reference, subject to driving conditions.

Cons

Reusable media requires cleaning rather than simply replacing the filter when servicing is due.

Technical specifications

4 specifications

Identity
Brand	K&N
Model	33-3131

Dimensions and installation
Form factor	Rectangular
Dimensions listed	10.56"L x 8.06"W x 1.63"H

What to know before buying

Listing details to confirm

Vehicle compatibility varies by model year and configuration. Confirm that 33-3131 matches the exact vehicle before ordering. The listing title names Bronco, Escape, Focus, Maverick, and Corsair across select 2018–2025 vehicles, while the description lists Focus, Kuga, Bronco Sport, Maverick, Escape, and Corsair with narrower year ranges. Treat these compatibility details as inconsistent and confirm the specific application. The 75,000-mile cleaning interval is stated for normal highway driving, not as a universal interval. Warranty wording is limited and subject to limitations.

What’s in the box

Included

Air filter

Who is it for?

A good fit for

Drivers of a confirmed compatible vehicle who want a reusable engine air filter.
Owners comfortable with periodic filter cleaning instead of routine disposable-filter replacement.

Less suited to

Buyers who want a disposable filter with no cleaning or re-oiling maintenance.
Anyone who has not confirmed fitment for their exact vehicle and model year.

K&N 33-3131 Washable Engine Air Filter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 529 ratings

5 stars86%86%
4 stars8%8%
3 stars3%3%
2 stars0%0%
1 star3%3%

Customer feedback is positive about throttle response, ECO-mode acceleration, fit on Bronco Sport models, fuel mileage, and installation ease. These are customer-reported impressions rather than guaranteed outcomes. They may matter to buyers considering the listed reusable drop-in design, but feedback does not establish results for every vehicle or prove compatibility. Aggregate ratings are generally favorable, though a smaller share is low-rated.

Positive themes

Customers report improved throttle response and ECO-mode acceleration, especially on 1.5L engines.
Customers describe good fit on Bronco Sport models and easy installation.
Some customers report improved fuel mileage.

Frequently asked questions

Which vehicles does the K&N 33-3131 fit?

The title and description give overlapping but inconsistent vehicle lists and year ranges. Confirm fitment for your exact vehicle, year, and configuration before buying.

How often does the listing say to clean this filter?

It states every 75,000 miles under normal highway driving conditions, based on 15,000 miles per year. That interval should not be treated as universal for all driving conditions.

Is the filter reusable?

Yes. The listing describes washable, reusable cotton-gauze media. Reuse involves periodic cleaning rather than replacing it as a disposable filter.

Does the listing promise a power increase?

The maker says the filter is designed to increase horsepower and acceleration, but the supplied information does not establish a measured result for a particular vehicle.