Out of curiosity, I see that some Jeep owners on the board here are using the smaller (narrow) FL400S instead of the FL300 (same size as the OEM Mopar MO-090) or long FL1A on their Jeep 4.0 engines. What is the reason for using the smaller, narrower filter? I know that in this application space is not the issue.
I have been using the long Motorcraft FL1A for years on my '96 Jeep 4.0 with the occasional Mopar, NAPA or Purolator. Our '08 Commander 4.7 has a Motorcraft FL820S on it now which is functionally identical to the Mopar metric thread MO-899 (and cheaper).
Andrew S.
Silicone ADBV on the FL400S-although I'm now using the Ultra XG8A on the XJ 4.0 in my sig, for two 5K OCIs.