One from 2007 and two from 2012 performed on GM trucks and this is the conclusion:
"we can't say that all oiled filters are worse than dry filters, but from the data we saw, it is worth noting their placement."
Each of us takes our own risks/rewards for the mods we choose to spend our money on and the debate over CAI/oiled filters will continue just as the debate over which oil to use or which spark plugs are best. I know this, after 3+ years of oiled CAI use, my Boxster, with 117K miles, runs just as good, and perhaps better, than it did with a paper filter and restrictive OEM air box. Max torque and hp kick in around 1K rpm sooner than with the OEM filter. The oil that is drained at 5K miles, and the filter, are almost as clear as the new oil put in. If there is any motor wear after three years it doesn't seem evident. I've never recommended anyone do the mods I've done, it is their choice, I only give my experience when asked.
