I'M USING A TRUE FLO FOAM 2 STAGE FILTER FOR BOTH MY GM DURAMAX'S AND I OIL THEM WITH BELRAY DIRT BIKE FOAM OIL. THESE FILTERS CATCH EVERYTHING INCLUDING THE KITCHEN SINK AND I NEVER WORRY ABOUT SLIT OR FINE DUST GETTING THROUGH!
GLWBEAR
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GLWBEAR
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