The owners manual for my 9 HP Honda on my Little Wonder says .64 of a quart is needed. But I just filled it up and it took about .95 of a quart. I've never payed attention to how much I used before. I just filled it up until you can't put in anymore. And no this doesn't have a dipstick so I just pour it into one of those two side fill holes that are near impossible to pour into unless you have a funnel. So how much should I put in?