I have to agree with MNgopher. The FRAM X2 ExtendedGuard is apparently a good oil filter (although Bob did notice a lot of oil flow restriction with this filter in his oil filter flow tests) but when I checked the price of this oil filter at my Checker Auto Parts Store, it was something like 12 bucks. You can buy a Mobil 1, K&N, or Amsoil oil filter for that price.
FRAM uses metal endcaps in the case of the X2. Why? Cardboard in used in their other oil filters for car, light van, light truck, and SUV use. They may use metal endcaps in their oil filters for heavy truck use-I don't know. On the other hand, Purolator has apparnetly used cardboard endcaps on some of its oil filters and I saw a Casite that had been cut apart that had cardboard endcaps (unless somebody had switched the internals). FRAM had some explanation for the use of metal for the endcaps in the X2, but I can't remember what that explanation was.
Bob did get very low wear results using a cheap basic FRAM oil filter and Schaeffer's MicronMoly motor oil. It may be that flow ismuch more important than filtering quality. Maybe not much junk gets into the engine if you have a high quality air filter.
FRAM does have a confusing many leveled line-up of oil filters. Other people have one quality level or only a few. WIX, as far as I know, has just one quality level for ordinary vehicles, and they also make oil filters for race cars. I can buy a WIX with a silicon adbv at a story in a nearby city for less than 5 dollars. Why should I buy the FRAM X2 at more than twice the price.