Engines are just like people. It's not the age, it's the condition. What's bad for engines is lack of use, and obvious things like never changing the oil or not using enough two-stroke oil. The $5.50 synthetics like Amsoil or Mobil One do a better job than the 1.09 Wal-Mart oil, Amen!
Mystery Oil in the gasoline is excellent for four stroke outboards and inboards and no good for two-stroke outboards but does not mix well with synthetic oils. Don't know why but was told that by a small engine repair expert. TechRon carb & injector cleaner, made by Chevron and very pricey, is great for cleaning out injectors, carburetors and gasoline filters and increases mileage.
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