Of my four water airplanes I have right now only one is a four stroke, a 105" old time Quaker. The engine on it is a Saito .56 that has hundreds of flights on it, all on the Quaker and has been dunked many times, as on the 2 strokes all I do is flip the plane up right, prime the crap out of it and start it, get in the air ASAP and keep flying. NEVER PUT IT AWAY AFTER A DUNKING. Flying the airplane again heats it up and gets all the water out while lubing it with the oil in the fuel. I only us Power Master 10%, 100% synthetic oil....