Rod bearings and piston rings take a lot of abuse in a golf cart engine from constant stop/start shock loads. I would not use an ILSAC rated oil in these engines. Use HDEO like Rotella 10w30 or even 15w40 with their high wear additives like molybdenum, phosphorus, and zinc.
Yamalube 10w30 will be fine even in the summer heat. I hear a lot of rod/piston slap during takeoff from golf cart engines that haven't had regular oil changes
