I'm new in your forum, so can you tell me or give me informations or testings about the best filter or filtration' system to install in a car? Because, in their ads (like Fram), they say, for exemple: 97% for the first pass, but they dont tell if it is 97% of heavy rock or fine particule. i didn't find how much micron...,
Thank you

there is a nice article over here....

http://www.oilfilterstudy.com/