Hey guys! I just read that air filter article with the Duramax. Kinda sounds lik GM secretly promoting thier own filters, thats just my opinion.
Also the Duramax is a Turbo , thier for its drawing X more air than a normally aspirated engine.
I do understand why the K&N has more dirt/dust build up, its the oil on the filter. The AC Delco is paper, as long as its dry, when dirt/dust acumilates it just falls off when throtle is released.
Very interesting article, thanks Bob!
On the oil filters, I hav seen a few, that when they get hot the glu used to adhear the filter medium inside loosens up and lets oil blow by with out geting filterd, thats not good!
I just switched to the K&N oil filter, hoping its as good as I hav read.
As for a longer or bigger filter, it can make oil pressure run low. On My 89' firebird I use a longer filter, and my oil pres runs low at idle and a littel lowr at high speed. I dont think its enough to hurt the motr(starved for oil) but I supose if its to low, you could do damage.
Magnets!

thats a good scam!