Just picked up a 1989 thompson daytona 270 with twin 3.7 liter 4 cylinder merc cruiser motors. in nice shape needs some touching up but for $4500 bucks with a trailer I couldnt pass it up. I want to give it a complete tuneup, change all filters, oil in drives and motors ect..how do I change the oil in the drives? Are there any other filters I can change anywhere? I want to get this boat ready for the water and I dont want to miss anything. All the boats I have had are older so I am a little lost but I want to make this boat last so what is the proper matinence for a boat that has not been used consistantly in a couple years. Also I believe the boat is not fresh water cooled however there is a bucket for water in the engine compartment. i dont understand what the water is for. Any help getting started with this boat is greatly appreciated. thanks