To preface this question. I was never a fan of the old blue Subaru oil filter part number 12508AA15A. Most likely made by Fram and very cheap to boot as well. So I switched to WIX-XP probably a good filter in lieu of the blue can of death. Now that Subaru of America is using the new Tokyo Roki filter part number 12508AA20A. My question is this does anyone know what the efficiency rating is for the filter media and is it a cellulose or synthetic blend media? Thanks for the info in advance. Also I am not interested in any other brands of oil filters. Not fram, k&N, mobil 1, etc…