all that "crap" that was stuck to the oil covered filter, was "crap" that the filter stopped from getting into your engine. thefilter you have now, does not catch the ultra fine stuff. they are ok for larger engines, where very fine dust doesn't hurt, but the tolerances on these engines is to tight and the dust will kill them. if you dont believe me, do a search for KnN filter on here. it has been brought up, discussed, and argued more times then i wish to count.