Originally Posted by T@co_Pr3runn3r
OK, NO! Other than it is the same clear color and consistency to the touch as it was out of the bottle new and I have never blown a motor in 36 yrs of tinkering with my rides so it might have but was not enough to matter. And if you don't go a yr without changing it, seems to me whatever silica in the oil goes out the drain hole.
And, if you start out using the vehicle in an environment conducive to lots of silica floating around to be sucked up into the intake then stay with paper.
Hold on, not trying to challenge you. Just trying to seperate the subjective from the objective.
Definitely agree that there are many out there that swear by K&Ns and have used them forever. That just leads me to believe that while the data shows that silica levels increase, that increased silica may not be sufficient to cause long-term damage or shorten engine life. What silica level, over what period of time, that turns out to be problematic though is data that I haven't seen anywhere. Would certainly help close the loop though if it could be found.
Like you referenced, regular oil changes also help guite a bit here, by removing the silica and starting over.
Personally though, I'm not going to take the risk of the K&N. Paper filters better, and if reusable is a concern, the aFe Pro-dry drop-in shows some increased silica levels in the oil when the air filter
is totally clean, but run it for a bit to dirty it up some, and the silica levels level off.