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Product guide

K&N 33-5126 Washable Engine Air Filter

The K&N 33-5126 is a washable, reusable replacement engine air filter listed for select BMW 760Li and M760Li xDrive, and Rolls-Royce Cullinan, Dawn, Ghost, Phantom, and Wraith models. Its vehicle-specific fit and long cleaning interval may appeal to owners seeking a reusable alternative to disposable filters, but compatibility should be matched to the exact vehicle.

At a glance

Washable and reusable design is presented as an alternative to frequently replaced paper filters.
The listing says cleaning is needed every 75,000 miles under normal highway driving conditions, using 15,000 miles per year as its assumption.
Four cotton-gauze layers with a tacking agent are described as trapping contaminants.
K&N claims the filter media is designed to increase horsepower and acceleration. These are manufacturer claims, not independent measurements.

Price

$50.39Save 20%

Reference price: ~~$62.99~~

Price checked: Nov 14, 2026

View offer

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

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Pros and cons

Pros

Reusable construction may reduce the need to replace a disposable filter at each service interval.
The stated 75,000-mile cleaning interval is useful for buyers whose driving matches the specified normal-highway condition.
The listing provides specific model-year fitment ranges for several BMW and Rolls-Royce vehicles.

Cons

This reusable filter still requires periodic cleaning, unlike a disposable replacement that is changed instead of serviced.

Technical specifications

17 specifications

Identity
Brand	K&N
Model	33-5126
Fit type	Vehicle Specific Fit
Product grade	Performance Part

Dimensions and installation
Form factor	Rectangular
Dimensions listed	10.47"L x 1.75"W x 11.59"H
Weight listed	1.3 pounds

Materials and service
Filter construction	Multiple layers of premium cotton gauze treated with a specially-designed tacking agent
Cleaning interval claimed	Engine air filter only needs cleaning every 75,000 miles under normal highway driving conditions (based on the average miles driven per year of 15,000 miles)

Fitment listed
BMW	2010-2015 BMW 760Li
BMW	2017-2022 BMW M760Li xDrive
Rolls-Royce	2018-2023 ROLLS ROYCE Cullinan
Rolls-Royce	2015-2023 ROLLS ROYCE Dawn
Rolls-Royce	2009-2023 ROLLS ROYCE Ghost
Rolls-Royce	2018-2023 ROLLS ROYCE Phantom
Rolls-Royce	2013-2023 ROLLS ROYCE Wraith

Warranty claim
Manufacturer warranty description	1,000,000 Miles/10 Year

What to know before buying

Listing details to confirm

Fitment wording is inconsistent: the title describes compatibility with 2010-2023 BMW/Rolls-Royce, while the detailed list gives separate model-year ranges, including a 2009 Ghost. Confirm the exact model and year before ordering. The listing's high-flow, power, and acceleration benefits and warranty are manufacturer claims, with warranty limitations noted but not detailed.

What’s in the box

Included

1 air filter

Who is it for?

A good fit for

Owners of a listed BMW or Rolls-Royce model who want a washable, reusable engine air filter.
Drivers following normal highway use who value the stated long interval between cleanings.

Less suited to

Owners whose vehicle or model year is not among the listed fitments.
Buyers who prefer a disposable filter that does not need cleaning and reuse.

K&N 33-5126 Washable Engine Air Filter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.8 / 5 · 113 ratings

5 stars92%92%
4 stars3%3%
3 stars4%4%
2 stars1%1%
1 star0%0%

Customer feedback describes good quality, a good fit, improved performance, and value. However, the reported fit example concerns a 2022 Pathfinder, which is not among this listing's stated BMW and Rolls-Royce fitments. Treat those comments as general feedback rather than confirmation of compatibility for the vehicles listed here. The rating distribution is mostly five-star but also includes lower ratings, and does not establish why customers chose them.

Positive themes

Customers report good quality and fit, and describe improved performance and value.

Frequently asked questions

Which vehicles does the listing name as compatible?

It lists BMW 760Li model years 2010-2015 and M760Li xDrive 2017-2022, plus Rolls-Royce Cullinan 2018-2023, Dawn 2015-2023, Ghost 2009-2023, Phantom 2018-2023, and Wraith 2013-2023. Verify fitment for the exact vehicle because the title gives a broader and inconsistent year range.

How often does K&N say the filter needs cleaning?

The listing claims cleaning every 75,000 miles under normal highway driving conditions. It relates this estimate to an average of 15,000 miles driven per year, so it is not a universal interval for every use pattern.

Is the filter disposable?

No. It is described as washable and reusable, so it needs cleaning rather than routine replacement as a disposable filter.

Does the listing prove a horsepower increase?

No. The listing says the filter is designed to increase horsepower and acceleration, but it provides no independent test results establishing a specific gain.