P621725 Engine Air Filter for Kenworth T680 T880 (Blue)

In this review of the P621725 engine air filter the bottom line is simple: this is a practical, direct-replacement air filter for heavy trucks that need reliable filtration without fuss. The reviewer found it well suited for fleet mechanics and owner-operators who run Kenworth T680 or T880 and various Peterbilt models because it replaces several common OEM and aftermarket numbers, removing guesswork when ordering. Its main selling point is broad compatibility with PACCAR and Cummins engine families, making it a convenient parts choice for shops that service multiple models.

Key Features

• Wide compatibility: Fits Kenworth T680 and T880 as well as Peterbilt 567 and 579, reducing the need to stock multiple filter numbers.
• Engine coverage: Compatible with PACCAR MX11, PACCAR MX13 and Cummins X15/ISX engines so it works across common heavy-duty powertrains.
• Cross-reference replacements: Replaces Paccar P621725, Luber-Finer LAF6725, Donaldson P637453 and others, making part lookup easier for technicians.
• Aftermarket convenience: Sold as a single filter that matches familiar OEM dimensions and function, helping quick installs during routine service.
• Visible identification: The filter arrives in a blue finish that distinguishes it from other stock items, aiding fast parts selection in a busy shop.

Who It's For

This filter is aimed at fleet managers, diesel mechanics and owner-operators running Kenworth T680 or T880 and Peterbilt 567/579 trucks with PACCAR or Cummins engines who want a reliable replacement that cross-references common part numbers. It is useful for maintenance shops that prefer to carry one compatible item that fits multiple engine variants and years.

Those looking for a performance or high-flow racing air filter should look elsewhere; this product is intended as a standard replacement filter that focuses on compatibility and routine filtration rather than sport tuning or specialized filtration media.

Pros & Cons

Pros

• Broad compatibility with PACCAR and Cummins engines reduces stocking errors and simplifies ordering.
• Replaces multiple well-known part numbers, so it integrates with established maintenance records.
• Good fit-and-forget replacement that installs the same way as OEM filters, saving shop labor time.

Cons

• Not marketed as a high-performance or specialty filtration option, so customers needing increased airflow or extended service life may prefer premium-brand filters.

Specifications

Our Verdict

The P621725 by SOKAKOSC is a solid replacement air filter for technicians and fleet owners who need one reliable part that fits multiple Kenworth and Peterbilt engine applications. It delivers straightforward compatibility with common OEM numbers and is good value for routine maintenance when a standard OEM-equivalent filter is required.

Frequently Asked Questions

Will this filter fit a Kenworth T680 with a PACCAR MX13?
Yes. The filter is listed as compatible with the PACCAR MX13 engine used in Kenworth T680 models.

Which aftermarket part numbers does this replace?
It replaces Luber-Finer LAF6725, Donaldson P637453, Baldwin PA32000, Wix WA11058 and NAPA 501058 among others.

Is this a performance upgrade filter?
No. This is a direct replacement designed for standard filtration and compatibility rather than increased airflow or performance tuning.