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'78 or '79 Clinton Engine 5.5 hp outboard question

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  • '78 or '79 Clinton Engine 5.5 hp outboard question

    I recently purchased a Montgomery Wards branded 5 hp outboars that was made by Clinton Engines. It is a K505 model made around 1978-79. The mixture ratio on the tank says "50 to 1 USE SAE 20W oil". Now my problem is finding ""SAE 20W" oil. Nobody seems to know what I am talking about. I mixed up some 40W motorcycle oil and gas just to give the motor a test run in my garage for a couple minutes. Once I finally got it to kick over it ran ok but it REALLY smoked!

    So what should I get for this because I cant seem to find what the manual says you need to use.
    Catching fish on water your fancy Bass boat cant go :)