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2018 M109R BOSS
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135 Posts
I've always used the suzuki brand(Ecstar) oil 10W40 in mine with a K&N filter. slowly making the transition to synthetic. runs like a top on that.
 

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5,918 Posts
Ecstar is synthetic. I use the 20w-50 Ecstar in mine.
 

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I use Amsoil and K&N oil filter because I like the nut on the end for easy removal. I ran Royal Purple for a spell, but the shifting was smoother longer with the Amsoil.
 

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2008 M109R, 2016 FJR1300, 1999 VMax
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5,887 Posts
Rotella. I prefer Rotella-T, because I only ride my 9 in warm weather. Others like the synth for colder weather.
It has high zinc content which is good for preventing wear, and it's inexpensive too. I have been using in all of my bikes for over a decade.
GOOD STUFF!
 
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