A Yamaha representative told me that synthetic is fine. I have been using Mobil 1 10w-30 for several years. The owner's manual only specifies 10w-30 and API Service SE, SF, SG (which are obsolete API ratings). Any contemporary 10w-30 oil is fine.
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Originally Posted by jchase
Yamaha DOES NOT recommend synthetic oil since it's a splash system. The also recommend 10/30 oil. Not 10/40. I texted them a couple of years ago about the oil velocity, and they said only 10/30. They should know. The drain plug is on the bottom of the engine on the side, underneath the clutch. Make sure you change the aluminum gasket on the drain bolt.
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