I have been noticing black residue on the crank side of my dip stick and nothing on the other side of the stick, i have been using the valvoline race oil. I recently ran out and bought some brad penn oil and now the black residue is not showing up on the dip stick. I wounder if that valvoline oil is what was causing this residue? Last year when i freshened the motor it had a layer of black crap in the bottom of the oil pan; You think its the oil?
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