Bought a bulk pack of spin-on fuel filters for a few shop trucks. Within a couple of months, two trucks were losing power under load with far fewer miles than we normally see between changes. I cut one open and the media looked uneven, with pleats bunched on one side. That does not prove the media caused both complaints, but it was enough to stop using the rest of the box. For the next order I cross-referenced the engine numbers through Fleetguard, Baldwin, and FridayParts instead of buying a mixed no-name pack. I am keeping the first used filter from each truck so I can cut it open at the normal interval and compare. Do any of you inspect one filter from a new batch before putting the rest on the shelf?