So according to the following NAPA memo from 2008: NAPA memo
NAPA makes separate filters for Chrysler and Ford applications due to the different pitch of the 22mm threads on the Chrysler engines.
So why then do other manufacturers specify the same filter for both Chrysler and Ford applications?
The NAPA filters in question cross reference to the Fram XG2, Bosch 3410, etc., which are listed for both Ford and Chrysler applications. If you go to Rockauto.com it lists the Wix 57899 and MC FL-820S for my 2013 Dodge 5.7 Hemi. Then Rockauto.com lists the MC FL-820s and Wix 53172 for a 2008 Mustang 4.6L.
So WIX/NAPA states different filter applications between Chrysler and Ford, but everyone else says they are the same.
Does anyone know why this is?