I don't believe you understand the concept of a multi-viscosity oil. 10W-30 will flow better than straight 30 at below operating temperature and flow like straight 30 at operating temperatures (typically around 200+ F). There is no downside and only upside from a lubrication point of view. It does drop into the 20s (F) around here. Also, in the case of Yamaha, they recommend 10W-30. I don't believe in second guessing the people who designed the engine.
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Originally Posted by davefin
I cannot imagine anyone in Florida requiring a multi-viscosity oil (10W30 or 10W40) in their golf cart. This is oil for cooler conditions. The 30W is fine.
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