Hello and Thanks in advance for your help I have a 1988 Yamaha 90 hp I changed the lower unit oil today. The oil that was inside looks very good not a sign of water at all. I pumped in almost one quart ( I let it drain for two hours) and plugged the top hole and added two short pumps of oil in to compensate for the little that came out the top hole.I plugged the bottom drain and some oil started to come out where the water gets picked up to cool the motor. Some came out on both sides. Is this normal? did a seal blow? I did not add that much more? If this is an issue is this an expensive fix if I remove the lower unit and bring it two a shop.Thanks again.
