P621725 Engine Air Filter for Kenworth T680 T880 - Replacement Fit

In this review the reviewer looked specifically at the P621725 engine air filter as a direct replacement option for heavy-duty Kenworth and Peterbilt engines. The bottom line: this filter is for truck owners and fleet technicians who need a compatible, no-frills replacement that matches common OEM and aftermarket cross references. It earns attention because it fits PACCAR MX11 and MX13 applications as well as Cummins X15 and ISX families, so the single biggest reason to buy is broad engine compatibility that simplifies parts sourcing during routine service.

Key Features

• Wide compatibility: Covers Kenworth T680 and T880 plus Peterbilt 567 and 579 engines, reducing the need to stock multiple part numbers.
• Multiple engine families supported: Works with PACCAR MX11, PACCAR MX13, Cummins X15 and ISX variants so it fits common heavy-duty diesel setups.
• Direct replacement references: Listed as an alternative to LAF6725, P637453, PA32000, WA11058 and 501058 to help technicians cross-check inventory quickly.
• Aftermarket convenience: Supplies a cost-effective option for routine maintenance without changing engine components.
• Brand backing: Sold under HPOPUAUTO which positions it as a straightforward replacement part for commercial trucks.

Who It's For

Truck owners, fleet maintenance managers and independent diesel technicians who service Kenworth T680, T880 or Peterbilt 567 and 579 rigs will find this P621725 fit useful because it matches common OEM cross references and engine types. Its broad compatibility with PACCAR and Cummins engines makes it a practical part to keep on hand for scheduled air filter changes.

Those seeking a specialized performance filter or a branded OEM element with manufacturer warranty backing should consider looking elsewhere; this product is presented as a reliable aftermarket replacement rather than a high-performance or certified OEM component.

Pros & Cons

Pros

• Compatible with multiple PACCAR and Cummins engine families, simplifying parts choice.
• Cross-references common aftermarket and OEM part numbers for easy verification.
• Useful for fleets that want a single replacement option across similar truck models.

Cons

• Not promoted as an OEM-branded filter, so customers wanting factory-certified parts may prefer the original manufacturer.

Specifications

Product name	P621725 Engine Air Filter
Compatible vehicles	Kenworth T680, T880; Peterbilt 567, 579
Compatible engines	PACCAR MX11, PACCAR MX13, Cummins X15, Cummins ISX
Replaces	Luber-Finer LAF6725; Donaldson P637453; Baldwin PA32000; Wix WA11058; NAPA 501058
Brand	HPOPUAUTO

Our Verdict

The P621725 is a practical aftermarket air filter for Kenworth and Peterbilt diesel trucks that need a dependable replacement matching common cross references. For fleet maintenance and independent shops it represents good value because it covers multiple engine families and cuts inventory complexity, though operators seeking factory OEM certification should weigh that preference against the cost savings.

Frequently Asked Questions

Will this filter fit my Kenworth T680?
Yes; the P621725 is specified as compatible with Kenworth T680 engines using PACCAR MX13 or MX11 and certain Cummins X15 applications.

Which part numbers does this replace?
It is listed as a replacement for LAF6725, P637453, PA32000, WA11058 and 501058 for cross-checking with existing inventory.

Is this an OEM filter?
This is an aftermarket HPOPUAUTO replacement designed to match fitments and references rather than being a factory-branded OEM element.