Ford changed the filter spec on the Coyote 5.0L V8 from the FL820S to the FL500S starting in 2015. Both those filters are pretty close in size. Could be that something is different between them, like the bypass valve setting maybe. Some people still use the FL820S for some reason even though the FL500S is specified, but the FL500S seems to be a more robust filter in terms of media tearing in use.So, prob same reason why I see f-250 with 6.2 gas engine with a PH 500 instead of correct FL-820S eh?