Doc's Auto Parts Engine Air Filter DA3590 Count:1 The DEF Guard Additive helps

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

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Reapply with each DEF fill-up for best results

Doc's Premium E-coated Front Wheel Hub Assemblies (DH515 Series) are covered by a limited lifetime warranty for the life of the original purchaser's vehicle

500 – 10

Doc's Auto Parts Engine Air Filter DA3590 Count:1 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