I need some help here please. A buddy loaned me his YZ450 for the weekend. I figured it'd be nice to change the oil before taking it out. He couldn't find his service manual before he headed out of town so I downloaded the owners manual (which is all I could find) and it pretty much told me where the drain plugs are. Here's my question. Two questions actually.....Without filter change does it really take only a bit over a quart? And if I add the fresh oil into the crankcase, will the motor pump the oil up into the oil tank? Thanks in advance for any advice. I only have experience with 2-stroke mx'ers.