P621725 Engine Air Filter Fit for Kenworth & Peterbilt - Reliable Flow

In this review of the P621725 engine air filter, the bottom line is straightforward: it is for truck owners and fleet technicians who need a direct-fit replacement for Kenworth T680, T880 and Peterbilt models and want dependable filtration without fuss. The reviewer found the P621725 to be a practical aftermarket option because it replaces several common OEM and aftermarket part numbers, making maintenance simpler for vehicles running PACCAR MX11/MX13, CUMMINS X15 or ISX engines. For anyone seeking a like-for-like replacement filter that matches common cross-reference numbers, this product earns attention.

Key Features

• Direct compatibility: Fits Kenworth T680 and T880 as well as Peterbilt 567 and 579 models, which simplifies ordering for mixed fleets.
• Engine coverage: Works with PACCAR MX11, PACCAR MX13 and CUMMINS X15 and ISX engines so it suits trucks with those common powertrains.
• Cross-reference replacements: Replaces Paccar P621725, Luber-Finer LAF6725, Donaldson P637453, Baldwin PA32000 and Wix WA11058, reducing part number confusion.
• Aftermarket value: Provides the same basic form and fit as the referenced filters, allowing routine service intervals without vehicle modifications.
• Service convenience: Compatible cross-listings make it easier to stock a single filter for multiple models during scheduled maintenance.

Who It's For

The P621725 is best for owner-operators, fleet maintenance managers and independent shops that maintain Kenworth T680, T880 and Peterbilt 567/579 trucks powered by PACCAR or CUMMINS engines and who prefer a direct-fit aftermarket replacement. It is also useful where parts cross-reference lists are used to streamline inventory.

It is not aimed at users seeking a branded OEM filter warranty or advanced media claims not stated by the listing; buyers requiring manufacturer-certified parts should verify with their dealer before replacing critical fleet components.

Pros & Cons

Pros

• Direct-fit compatibility with multiple Kenworth and Peterbilt models simplifies parts procurement.
• Cross-replaces a wide range of known part numbers, helping shops keep fewer SKUs on hand.
• Suitable for PACCAR MX11/MX13 and relevant CUMMINS engines, covering common heavy-duty applications.

Cons

• Listing does not include detailed filtration media specifications, so buyers must accept it as a form-fit replacement without lab-rated efficiency data.

Specifications

Product name	P621725 Engine Air Filter Fit for Kenworth T680 T880, Peterbilt 567 579
Compatible brands	PACCAR, CUMMINS
Compatible engines	PACCAR MX11, PACCAR MX13, CUMMINS X15, CUMMINS ISX
Replaces	Paccar P621725; Luber-Finer LAF6725; Donaldson P637453; Baldwin PA32000; Wix WA11058; NAPA 501058
Applications	Keenworth T680, Kenworth T880, Peterbilt 567, Peterbilt 579

Our Verdict

For technicians and truck owners who need a straightforward, cross-referenced replacement for PACCAR and CUMMINS-powered Kenworth and Peterbilt trucks, the P621725 is a practical, cost-conscious choice. It delivers the convenience of direct-fit compatibility and broad part-number coverage, making it good value for routine maintenance when OEM certification is not required.

Frequently Asked Questions

Will this filter work on both PACCAR MX13 and CUMMINS X15 engines?
Yes. The listing specifies compatibility with PACCAR MX13 and CUMMINS X15 engines used in the named Kenworth and Peterbilt models.

Does it replace common aftermarket part numbers like LAF6725?
Yes. The P621725 is listed as a replacement for Luber-Finer LAF6725 and several other common cross-reference numbers.

Is detailed filtration efficiency provided?
No. The product listing focuses on fit and cross-references rather than published media efficiency ratings, so verify acceptance for your service standards before purchase.