Just bought a bike (XR650L) and before I do much riding I'm going to change the oil and replace the oil filter. It has over 5000 miles on it and I'm unsure of the previous owners maintenance upkeep. Question 1) what grade of oil does this bike use? 10W40? 2) How much oil will I need to buy? I would guess 2 qts should cover it correct? 3) Bike seems to burn just a little bit of oil and after every ride my clothes smell like exhaust/oil. It has a HMF slip on with disc on the end. The darn thing shoots the exhaust right toward my leg which I'm sure is why I smell like oil/gas after riding. It's got a good seal at the clamp for the slip-on. Does anyone have this same problem? I am also on a new tank of gas thinking maybe the gas was tarnished and that's why the exhaust smell was so strong. New gas didn't help much. Any input is appreciated. Thanks!