i have recently switched from using..gasp! fram ph3600 filters on my 3.0 v-6 ranger to the napa silver 21516's. i know these are made by the wix corp, and that they are not as good as the gold napas, but in the fellas opinions, is this a step up? i rarely go over 2 thousand miles between changes, as i use a conventional oil,{pennzoil,5w30 dino,} and work is less than 2 miles from home. thanks for the help!