it really doesn't matter, because 1% is 1%. any way you look at it. Also, it depends on your driving environment. As a filter begins to soil, it filters better than when it is clean. So say, someone who lives in Los Angelos will have made up the 1% difference within a day compared to someone in Denver CO. Actually, who cares, better performance, and the small dirt particle that will pass at 1% will have virtually no effect on your engine as long as you change your oil regularly...Wake up people.....common sense....and common math...3%-2%=1% Robb
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19 years ago