Wix 49478 Engine Air Filter - Primary

WIX HD Engine Air Filter 49478

The WIX HD Engine Air Filter 49478 is built for heavy-duty air filtration in applications that demand consistent airflow and contaminant control. Its cellulose media, panel-style construction, and durable end-cap design support OEM air filter change intervals while helping protect the intake system.

Key Features

• Premium cellulose filtration media for engine air intake service
• Skip-a-pleat media stabilization and pleat stabilization beads where applicable
• Polyurethane or corrosion-resistant end caps for durability
• Expanded metal body construction for added strength
• Laboratory-tested to ISO 5011 standards with minimum 99.9% contaminant removal based on WIX HD test data
• Panel-style air filter with closed inner diameter top
• Dimensions: 26.18 in. length, 9.27 in. width, 5.23 in. height

Detailed Description

WIX 49478 is an engine air filter designed for heavy-duty service where clean intake air matters. The filter uses cellulose media in a panel format to capture airborne dirt and debris before they reach the engine, while the reinforced construction helps maintain shape and service life under demanding operating conditions. This part cross-references Donaldson P610260 and Fleetguard AF27879 for the same application. It is a direct-fit style replacement for select Mercedes-Benz and compatible diesel applications that use this filter size and configuration.

For buyers searching for a Mercedes-Benz air filter, WIX 49478 also appears in cross-reference listings with NAPA Gold 9478 and FRAM CA11249. If you are servicing a Mercedes-Benz or related application that calls for this panel air filter, this part number is a relevant match to verify against the original equipment specification.

Common Issues This Filter Helps Address

• Restricted engine airflow from a loaded or dirty air filter
• Excess dust and debris entering the intake system
• Premature intake wear caused by poor filtration
• Reduced service consistency in heavy-duty operating conditions
• Incorrect replacement filter size or style during maintenance

Installation Notes and Tips

Confirm the filter dimensions, panel style, and closed-top configuration before installation. Compare the old filter to WIX 49478 and verify the housing shape, length, width, and height match the vehicle’s airbox requirements. For Mercedes-Benz air filter service and other make/model applications, check the OE part number and service manual before replacing the element.

Quality Assurance

WIX HD air filters are built with reinforced materials and tested to ISO 5011 filtration standards. The manufacturer recommends this filter for OEM air filter change intervals, making WIX 49478 a practical service part for routine intake maintenance on select Mercedes-Benz and related applications.