You can use 10w-30 synthetic just fine. 10w-30, what Yamaha specifies, has the same cold (the "10" number) and same hot (the "30" number) viscosity (+/- within the API standards) whether it is synthetic or conventional oil. Considering that synthetic is better at maintaining it's viscosity than conventional oil, I am not sure why anyone would choose not to use synthetic.
Quote:
Originally Posted by jchase
Also, there has been a lot of controversy on this. I texted a Yamaha technician about the use of Synthetic oil. He stated NO! It is a splash oil system and synthetic oil is to thin. Use 10 w 30 oil for our climate here in Florida. I change mine every six months.
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