I changed the oil in my YZ450 this afternoon for the first time since getting a stainless steel reuseable oil filter. I cleaned it in a pan of mineral spirits with a tooth brush (tastes horrible now). Afterwards I filter the mineral spirits back into the can for reuse. I noticed what I thought was an excessive amount of debris had come off the filter. I should have taken a picture of it. Not like I was panning for gold or anything, but definitely metallic. Being new to dirt bikes and brand new to a cleanable oil filter in any application, I was wondering if any experienced guys had any comments. Is this normal? Or is my bike grinding itself into oblivion? Or both? Bear in mind that I ride like a little girl and this oil had possibly 20 hours of running time on it. Half of that is probably idling. The bike seems to run well (but I may not know what a well running 450 feels like).