C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Air Filter Element: Service Precautions
NOTE: This information is contained within GM Bulletin 05-00-90-001 dated January 5, 2005.
Subject: Information on the Proper Air Filter for the Duramax(R) Diesel
Models: 2001-2005 Chevrolet Silverado and GMC Sierra with 6.6L Duramax(R) Diesel Engines (VINs 1, 2 - RPOs LB7, LLY)
The Duramax(R) air filter. P/N 25332433, is specific to the diesel engine due to the operating characteristics of a turbocharged diesel engine. The
turbo allows for a much greater air volume rate than a normally aspirated engine. The Duramax(R) diesel air filter is reinforced to eliminate
damage from the increased airflow of the turbo. The reinforcement is visually identified by the five ribs of epoxy that lie across the pleats of the
clean side of the filter.
If the correct air filter is not used, the filter may collapse or be torn in a Duramax(R) application. This damage will allow dust and dirt to be
ingested into the turbo and engine causing serious damage. This damage is usually identified at the turbo vanes as well as extreme wear in the
cylinder walls of the engine.
There is evidence of gasoline engine air filters being used in the Duramax(R) application. The 8.1 gas air filter, P/N 25313349 will fit into the air
box of the Duramax(R) diesel; however, it does not have the required reinforcement of the diesel air filter. The 8.1 liter gas engine air filter should
never be used in a Duramax(R) diesel engine.
