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Message: <blockquote data-quote="bigcity" data-source="post: 505304" data-attributes="member: 12916">5w/30 vs 10/w30 are both considered a 30 weight oil when measured at normal operating temps(100°c/212°f), and will remain the same viscosity at any temps at/near/above that.The 5w/10w is the oil's viscosity when measured at low temps(0°c/32°f). And really only tells you how the oil flows when really, really cold, at startup. So, unless you are using that outboard in really cold weather there is ZERO issue with using either oil. Even then it will only be at startup. But, BUT, that is where the vast majority of engine wear happens.Jeff</blockquote>