I don't own a gas cart. But I would simply call the 800 number for Yamaha and ask for a service expert for an opinion about 10W-30 vs 40 and whether it is ok that the local dealer is using a product other than that suggested by the manual.
1-866-747-4027
Of course they may refuse to answer your question and refer you back to your local dealer. Nah, I'm sure they will give you the answer to your concern.
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Men plug the dikes of their most needed beliefs with whatever mud they can find. - Clifford Geertz
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