Proper Air Filtration

[PRyker]

You guys that do regular oil analysis maybe you can answer a question for me:



1. What is the typical silicone number in an engine with stock air filtration?



2. Have people running the AFE Progaurd 7 filters seen an increase or decrease in silicone numbers?



3. In your opinion what system provides the best air filtration either stock or aftermarket and what type is it? Oiled or paper?



Keep in mind that flow volume is not the question here. It is filtration.



Thanks



Phil

 

[Gary - K7GLD]

From a similar current thread regarding the difference between a paper vs oiled media filter:



There are as many and MORE problems with dust leakage past the stock paper filters - but as mentioned above, owners don't realize it since without the slightly oily surface to trap and hold it, it simply blows on thru the engine...



Biggest problem with a paper filter is that when subjected to high air flow, or when they start getting dirty, they will physically distort, pulling slightly away from the sides of the airbox and allowing dirt to bypass the element. Next time you swap out a paper OEM filter, CAREFULLY check around the edges of the filter where it is supposed to seal - chances are, THIS is what you will see:



#ad




That tan colored stuff you see at the edges of the filter is DIRT! And that is the original OEM filter off my '02 at about 10,000 miles or less as I recall.



MEANWHILE, my last oil analysis at 5000 miles, using a K&N showed 3 ppm silicon...