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I just started winterizing motors tonight. I did 7 of my Mercury 200’s, and have a lot more to go. I will plan to winterize all of my runners. Even if I have not had them on the boat this year, starting them up, give the gears some exercise and get them up to temperature. The first thing I do is pull the drain plug on the lower unit, and if there was any water, it will be the first thing to drain out. If not, if the color is OK, I just make sure it is up to level and plug it back up. I have a tank of 16:1 that I have added Sea Foam stabilizer to. I then pull the fuel line, and run start fogging while the fuel runs out. I then pull the plugs to add a table spoon of TCW-3 in each cylinder and pull it through. I make any notes on what may need attention and add it to my spread sheet. I let them drain, wipe them off and place them back on the rack.
Steve