I was thinking? What do you think?

[phatdaddy]

When my dad had the lawn mower shop, 68-87, we sold lawn boy mowers. They were 2 strokes made by OMC. We would put about 3 or 4 in rental service for the summer. We sold OMC oil, but ran our rental fleet of of Gulf Pride 30 wt. never had an issue

So, worst case, you could run 30wt.