4-Stroke Equivalent
While Marvel Mystry oil is better than nothing, it is not very good. Now Marvel Mystry Air Tool oil is good. It has the necessary ingrediants to ward off the damage of moisture which the plain Mystry oil does not have. Remember, what you are trying to do is to displace the residue of the fuel products, especially any nitro that might be there. use at least a teaspoon full in the crankcase and tilt and turn the engine while turning over the prop to get the oil all around the front and rear bearings, especially in the 4 strokes where it must be injected into the breather hole to be effective; putting it only in the carb or exhaust does not do the job on 4 strokes.