Quote:
Originally Posted by akyp
From what I've googled it's the opposite - oiled filters trade filtration efficiency for flowrate. Based on this I've decided to sell my unused oiled filter and buy dry ones instead.
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Reduced air flow restriction is always accompanied by reduced filtration. Adding oil to the filter media increases filtration without reducing the flow rate. Therefore oiled media air filters generally offer the best combination of flow and filtration. All high performance air filters are a compromise between flow restriction and filtration efficiency but unfortunately there is no magical filter media that can filter as well as the oem dry paper yet offer reduced flow restriction.