I'm running a K&N set up, found this web site and found it interesting, although I will not change this I will more than likely run the AC DELCO on all my other cars & trucks.
http://www.duramax-diesel.com/spicer/index.htm
Mark
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This applies to Motorcraft filters also. How did you think K&N got the Higher flow numbers? A friend who has his oil tested everytime it is changed put a K&N on his F-350 Diesel. He changes oil every 5,000 miles. After the change to K&N and 5,000 miles the oil analysis showed a high Silica count. Just under where the alarm bells go off.
Impressive tests. I have a K & N in the garage I was saving for the Pantera, well its heading for EBay now. Shoot I have close to a hundred bucks invested in that dang thing.
Jeff
Jeff