Debs, I like your style!!! POINT OF CLARIFICATION: My fathers 12 valve that I referenced earlier runs very soot free as compared to my 24 valve. I just went to Amsoil about 5,000 miles ago. The Amsoil is like a laxitive for dirt, grime and sludge in an engine. Therefore, I have been trying to change the T/P every 1 to 2 thousand miles. I have not seen any channeling in the media. When my oil starts to soot up, I just change the T/P, add a quart of oil and keep going. I am sure that all by pass filters have some effectiveness. All the "Johnny come latelies" that are here now is a mind boggling thing. The one thing I do know is that Frantz Filters were "cool" before these other guys could spell F-I-L-T-E-R. Say you don't like 'em but don't say they don't work... ... ... ... mi dos pesos.