Any filter with really wide pleat spacing has the potential to tear media, unless the media is wire or nylon backed.You don't see those 'wide pleats' on $2 Prime Guard/Premium Guard filters. Are the domestic filter makers trying to save 5 cents worth of filter material? For this reason I'm hesitant to use an 'entry level' Fram, Purolator etc...
Hard to say exactly how each manufacturer comes up with an "up to xyx miles" use rating. All kinds of factors can effect the mileage rating, but the holding capacity should be the main factor.Also, If I'm not mistaken, the 5K STP filters are often identical to the ST 10K filters. I doubt the filter media is different so why does WM rate theirs 10K while AZ (STP) rate theirs 5K?
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