Wix 42729 Air Filter

WIX 42729 Engine Air Filter Overview

The WIX 42729 engine air filter is a panel-style replacement built for consistent airflow and engine protection in everyday driving. It is a direct-fit option for select Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, Isuzu Ascender, Buick Rainier, Saturn Ion, Chevrolet Trailblazer EXT, GMC Envoy XL, GMC Envoy XUV, Oldsmobile Bravada, and Chevrolet Blazer applications.

With a cellulose media design and a high-tear-strength polyurethane seal where applicable, this filter is built for normal commuting, stop-and-go traffic, dirt roads, construction zones, short trips, and highway use. The WIX 42729 is also recommended for OEM air filter change intervals.

Key Features

• Panel-style engine air filter for select GM and Isuzu platforms
• Cellulose media with 30% more media than OES filters
• Phenolic resin treatment helps improve durability against moisture ingestion
• Polyurethane seal resists hot and cold temperature extremes where applicable
• Laboratory-tested to ISO 5011 standards with at least 99.5% efficiency based on Wix 42389
• Part number: 42729

Detailed Description

The WIX 42729 is engineered around the filter dimensions and media construction needed for reliable intake protection. It measures 7.830 inches in height with a 5.980-inch outer diameter at both the top and bottom, a 3.325-inch inner diameter at the bottom, and a closed top. These dimensions support a proper seal in the airbox for the listed applications, helping maintain clean intake airflow under a wide range of driving conditions. This part number 42729 is a practical replacement choice for drivers servicing a Chevrolet Trailblazer, GMC Envoy, or Saab 9-7x air intake system.

This part cross-references FRAM CA9345 and NAPA Gold Filters 2729 for the same application.

What It Helps Address

• Restricted airflow from a loaded or dirty engine air filter
• Dust and debris entering the intake system during road use
• Reduced filtration performance during stop-and-go driving
• Moisture-related media wear in demanding weather conditions
• Airbox sealing issues caused by worn filter construction

Installation Notes and Tips

Verify the air filter housing shape and dimensions before installation. Replace the filter at the OEM service interval or sooner if driving conditions include dirt roads, construction sites, or frequent short trips. Confirm fitment by vehicle year, make, and model before ordering; this WIX 42729 fits 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, 2004-2007 Saturn Ion, 2002-2006 Chevrolet Trailblazer EXT, 2002-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, 2002-2004 Oldsmobile Bravada, and 2002 Chevrolet Blazer.

Quality Assurance

WIX specifies ISO 5011 laboratory testing for this filter line and publishes an efficiency rating of at least 99.5% based on Wix 42389. The enhanced cellulose media and moisture-resistant treatment are selected to support durable service in normal and severe driving environments.