I learned that mobil makes the Triumph oil, and filters. I use mobil v-twin 20w 50 and m108 filter. Out of 100,000 miles,85,000 has benn with it.
Change it every 3-4 thousand miles. Walley world has the best price on oil.Just wish they carried the filter too.

I was so much older then, I am younger than that now (Wrote By Dylan Sung by the BYRDS,)