Like he says, watch the oil, there will be a little circle on the back of the jug, if it says energy conserving in that circle, don't use it. I run 20-50 in the summer, and in the cooler weather 10-40, car oil, I don't spend the extra on the motorcycle only oil. I haven't seen any oil 10-40 or heavier that says energy conserving, but 10-30 and lighter does.