The manual for my '06 YZ450FV says to add an amount of oil if just changing the oil and another amount if changing the oil and filter which is understandable but then it states a third amount. Is that for overhaul only or is that what should be added when the oil is changed? I want to be precise as I want this bike to last a long time. Also it doesnt seem like it takes alot of oil. That surprised me. Any tips?