Today, after trying over and over I could not get my lower unit vent plug removed. So, wanting to fish the next day I simply shot air into the lower unit case so that the gear oil would come out of the fill hole faster. After all was drained I then pumped .80 quarts (suggested amount) of yamalube into the fill hole without the vent being opened. This is a 2018 Yamaha sho 115. Here's is why I'm hear, is this going to hurt anything that I didn't open the vent hole? Should I be worried that I may have too much gear oil in the lower unit? Should I drain and leave it alone until I get it done correctly?
