mobil 1 and motorcraft filter every 3K for me
the 3L still isnt ready for mobil 1, once i hit 2K im switching to mobil 1 (currently at 1800)
i buy a motorcraft filter because i change my oil so often and K&N is too expensive
i change my oil so much cause i beat the sh!t out of my car and race it alot (every week in the summer when the tracks open)
