Bought an 04 WR450 today, used with 380 kms. Brought it home and found the oil is creamy/brownish color, (I know I should have checked that). this bike is from up north in the Yukon, driven down wet muddy road to work every day (diamond driller). Purchased new in June & used for two or three months only. Could this simply be water from the road getting in to the oil somehow? Cold and damp have anything to do with it. (The oil has never been changed so original from break-in). Head Gasket? If so is this a big job $$$ wise (I am not a mechanic). Any other causes? Should I just change the oil and see if it goes milky again? Thanks for your input guys! Greg.