I use WIX oil filters on my vehicles. I found the filter at the WIX site and read the specs. In my location, the WIX brand is sold at O'Reillys, so I looked at their site and read the specs. The specs between those sites were different as to media and micron rating. Called WIX! WIX CS said the O'Reilly spec is old info. In 2009 WIX changed the media from paper to glass. Micron rating for the paper is/was 19 and for the glass media it's 5. I like 5. The date code on the filter will read something like: 10-02-09(month/day/year) Date code after yr code 09, is the new glass media filter. #57148 for the black body/#57348 for the Chrome body. Something else: AZ has M1 Twin-V MC oil at a $2/qt discount 'till 30 May.