I have an 03 wr450. 3rd owner (at least). I run spectro synthetic blend 10/40. My oil is completely cooked after about 100 miles to the point that is runs off the stick like brown water. Also in my oil filter and frame screen there is a lot of black crud. No idea what that is. Why is the oil so burnt out after so short a distance and what could that crud stuck in the filter be? I do have a rekluse with a bit of chatter occasionally. Could it be from the clutch slipping?