I've got the exact same motor and when I bought it (used) they told me to only use Mercury oil. Well, for the most part I have, but last year a mechanic told me that Mercury oil was no better than other oils. So for about 3 months last year I used whatever oil was cheapest and never had any problems. This year I started using only Mercury oil...why?....I guess I just like that cool black bottle. LOL
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