I have a 3.5hp 4 stroke tohatsu outboard.
I went to start it and oil came out of the carb. Only ran for a few seconds before turned it off. Is the motor ruined? What should I do now to save it?
Oil cannot hurt ANY part of the motor. Oil can be removed from just about anywhere. As mentioned, cleaning the carb is all you need to do. Any oil that spilled over into the valves or cylinders (if any) will burn off when starting it up once the carb is cleared.
Might need to crank a lot to get it started once the carb is clean. But nothing is damaged.
Winterization involves putting oil directly into the cylinders (and valves). In the spring, we all just crank a while to burn off the fogging oil and away we go.
Hell, cleaning the carb will probably make it run better than before the overfill.
My initial thought was it was laid down on the wrong side. If so it’s not ruined, stand it upright for a bit, check the oil, spray some carb cleaner and try starting it. It’ll probably be a little hard to get started at first. If it does start it may run a little rough and smoke for a bit. If it doesn’t start u may have to do a more thorough carb cleaning. Check the spark plugs and spray some carb cleaner in the plug holes as well. Good luck