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I have an 2001 F80 and run same oil all year. No issues so far for me.
X2
What does your manual say?
I run Yamalube 4M 10W-30 all year.
I know it says on the back of the motor under the cowl can not remember which one it is right now but Yamaha’s website lists the “10W30” and “20W40” as oils for this motors so thats why I am curious if people are running different oils in summer versus winter. Still going to change it in spring and fall either way just want to stock up a few kits….