I don't use any oil additives. You have a wet clutch. If you add a friction reducer additive you might make the clutch slip. I change my oil frequently about every 200-300 miles. That change interval is my thing and I'm sure you can go longer.
Sometimes I catch flack about my oil suggestions. These old bikes are a hobby for me. I don't ride the highway or take trips. Just a ride sometimes within the community and maybe 20-30 miles at a time.
So my oil suggestions are for the old Honda air cooled engines, pre-1970.
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