Looking for a little advise, please. I changed the outdrive lube yesterday and only had a quart for the job. It never made it up to the vent hole before I ran out and it doesn't even wet the bottom of the dipstick. Plus I spilled enough on my hands putting the plug back in to protect another small boat. Why can't I top it off through the vent hole? Do I have to remove the drain plug at the bottom of the drive and fill it through there, thus spilling/wasting more oil? Any advise would be appreciated.