Symptoms of ear infections usually include earaches or throbbing pain, sometimes a fever, and signs of inflammation near the ears like redness or fluid leaking out. Although antibiotics are assumed to be the treatment of choice for ear infections, you might want to reconsider this approach.
Two-stroke oil is different from regular motor oil. It is thin and specifically made to mix with gasoline in the gas tank of two-stroke engines. This is how the piston is lubricated in a two-stroke engine. Two-cycle oil is regular motor oil that you put in the oil filler hole on an automobile engine.
Re: automotive oil in 4 stroke outboard. My 2 cents is I have used auto oil for 8 years, and I think my 4 stroke is. running better now than when I bought it. I change it each spring. I doubt if you'll see a post from anyone stating that their motor was. harmed from using auto oil changed regularly.