Just started using purone filters after years of the cheaper fram etc. wally world and such filters. After much informationsearches and reviews on filters pulled the trigger and bought couple years worth of oil change filtters for two vehichlesto have on shelf ready. After about 1500 miles on one rig, oil still looks clean, so much for a single test,.) however,a start, and so far lives up to reviews, anf for about same money as cheaper filters,"alast better piece of mind, knowingi,m seeing a sign of better protection for only a little more mulla!!