Wix 42731 Air Filter

WIX 42731 Engine Air Filter for Heavy-Duty Ford Applications

The WIX 42731 engine air filter is built for heavy-duty air intake service with premium filtration media and a corrugated style design. It is a direct replacement for select Ford F-250 Super Duty, F-350 Super Duty, and Excursion models from 2003-2007, helping maintain clean airflow through the engine intake system.

Key Features

• Engine air filter for heavy-duty duty cycles
• Premium cellulose media for intake air filtration
• Corrugated style construction with oval-shaped profile
• Polyurethane and corrosion-resistant end caps for durability
• Expanded metal body for added structural support
• Laboratory-tested to ISO 5011 standards with minimum 99.9% contaminant removal based on WIX HD filter testing
• 775 CFM rating for airflow capacity
• Measures 10.730 in. height, 13.125 in. top outer diameter, 7.875 in. bottom outer diameter, and 6.250 in. bottom inner diameter

Detailed Description

WIX 42731 is an HD engine air filter engineered for OEM air filter change intervals and demanding service conditions. Its premium filtration media, pleat stabilization features, and durable end-cap and body construction are intended to support consistent airflow while capturing airborne contaminants before they reach the engine. This part cross-references Ford OE-style applications and aftermarket equivalents such as NAPA Gold Filters 2731 for the same application. Fits 2003-2007 Ford F-250 Super Duty, N/A; Fits 2003-2007 Ford F-350 Super Duty, N/A; Fits 2003-2005 Ford Excursion, N/A.

What This Filter Helps Address

• Restricted airflow caused by a dirty or clogged engine air filter
• Dust and debris entering the intake system
• Reduced filtration performance during heavy-duty use
• Premature wear from unfiltered contaminants
• Service intervals that require an OE-style replacement filter

Installation Notes and Tips

Verify the filter dimensions and housing shape before installation, especially on Ford F-250 Super Duty, F-350 Super Duty, and Excursion applications. Inspect the airbox, sealing surfaces, and intake ducting for dirt or damage before installing the new filter. Replace the filter at the manufacturer-recommended service interval or sooner if operating in dusty conditions.

Quality Assurance

WIX HD air filters use durable construction materials and filtration media tested to ISO 5011 standards. The brand specifies minimum contaminant removal efficiency of 99.9% based on referenced WIX HD filter testing, supporting dependable filtration performance for heavy-duty service.