Changing oil in foot of boat motor

[BearLakeFishGuy]

The extra hole is not lube, but exhaust. I talked to Lees Marine about it on my older Johnson. He said it was common and nothing to worrry about. My 150hp Yamaha take over a quart in the lower unit. I also keep my motor vertical while pumping it in. I just sit on the floor and pump away until it comes out the top hole. You are NOT supposed to reuse the little washers on the top and bottom screws. I replace mine each time I do the lower unit oil. I buy a half dozen washers at a time. About a buck each, but cheap when you think about cost of a lower unit, it is cheap insurance.