Doc's Auto Parts Engine Air Filter DA4873 Count:6 The DEF Guard Additive helps

The DEF Guard Additive helps prevent DEF crystallization that can clog the DEF filter

and 1 O-Ring

Safe for all diesel engines including pickups

and has lower cetane ratings that hurt performance

GMC (FW) SIERRA 2500HD 2WD

Doc's Auto Parts Engine Air Filter DA4873 Count:6 The DEF Guard Additive helpsDocs Auto Parts Engine Air Filters: Doc's Auto Parts Premium Engine Air Filters are built for reliable performance and everyday durability. They help block dirt, dust, and debris that can cause premature engine wear, keeping clean air flowing to your engine. A high quality silicone gasket creates a secure seal, even in harsh or dusty driving conditions, while deep pleated filter media captures more contaminants to support smoother operation, improved