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There's only one correct way to evaluate oil filters. That is to do a filtration test utilizing ASTM test dust mixed in the actual oil used in your car. In general, automotive filters are poor, they won't hold a candle to hydraulic and lubricating filters used in industry. That being said a high quality industrial filter will cost at least 10 times the cost of a Fram. I doubt that any of us would be willing to pay that kind of price. Cutting filters apart and examining filter media is useless, because how they look doesn't equate to actual performance. Any evaluation of filter quality should generate three numbers, filter efficiency at a given micron size (beta ratio), dirt handling capacity at a given flow rate, and pressure drop across a clean filter at a given flow rate. One of the largest variables in lubricant filtering is the lubricant itself. Some oils filter well while others tend to plug filters. I don't have any recent data on automotive filter testing; however, Mobil did some testing around 15 years ago that found Fram to be the best of the popular filters made at that time. After that study, all of the major filter companies began to introduce better filtration. Isn't competition great!
 
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