There is no controversy about the use of synthetics. The manual states 10w-30 with an API Service rating of SE, SF, or SG. These are old API Service ratings and virtually any oil, synthetic or conventional, easily meets these ratings. As long as the oil meets the multigrade specification (10w-30) and the API Service rating, it is fine. There is a reason there are industry standards.
So why use synthetics ? Oil has two components: the base oil and the additive package. The synthetic base oils can typically deliver multigrade viscosity ranges without the viscosity index improvers and pour point depressants required in conventional oil additive packages. When these additives are depleted, the operating temperature viscosity will decrease and the cold temperature viscosity will increase in conventional oils. Synthetics, on the other hand, will better retain their original viscosity and provide better protection as the oil ages.
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Originally Posted by JerryP
I agree, especially since my 2014 Yamaha manual specifically states the recommended oil as “YAMALUBE 4-cycle oil or SAE 10W30”. No mention of Synthetic oil.
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