I always use the FRAM Extendedguard xg8a[FL-1A] [METAL END CAPS ARE THE BOMB!]It is a super filter for long OCI with Synthetic oil...I go 12-15 months/7,000MI wich ever comes first. For $9.99 at Wal-Mart, it's the same price as a Mobile M1 filter, and I think it is slightly larger. I look at it...