Ah oils! Nothing on a motorcycle site is guaranteed to stir up a hornets nest more than a discussion on oils.
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For what it's worth, my Niner has done 115,000ks.  The dealer told me to use mineral oil for the first 10,000ks then switch to semi synth, and this is what I did. That makes 105,000ks that my bike has now existed on a diet of Silkolene semi synth 10w40. Oil and filter is changed every 6,000ks, and my bike has never used a drop of oil between changes, there's been zero mechanical issues too.
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I should add where I live in South Eastern Australia every winter we have overnight temperatures below zero celcius on occasion, and in summer temperatures will exceed 40c at least a few times. It's 3.30 pm and 27c at the moment
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For what it's worth, my Niner has done 115,000ks.  The dealer told me to use mineral oil for the first 10,000ks then switch to semi synth, and this is what I did. That makes 105,000ks that my bike has now existed on a diet of Silkolene semi synth 10w40. Oil and filter is changed every 6,000ks, and my bike has never used a drop of oil between changes, there's been zero mechanical issues too.
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I should add where I live in South Eastern Australia every winter we have overnight temperatures below zero celcius on occasion, and in summer temperatures will exceed 40c at least a few times. It's 3.30 pm and 27c at the moment
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