The factory manual says 1.0 Liter for oil change with filter change and 0.95 liter for oil change only. I changed out the oil and filter and put 950 mL's in measured using the standard graduated cup for mixing 2 stroke oils and STILL I had oil pucking from the end of the breather tube like crazy. Maybe 50 mL's or more! I have the re-route with the T fitting for a small clear vinyl tube oil catch so I can see how much oil is caught but it would quickly fill up and puke oil. I don't have the breather in the airbox but rather have a peice of old air filter foam quick tied to the end of the tube. Should I just measure the amount of oil I drain to see how much to put back in or does anyone have wisdom to share?