after researching here, other forums, first hand feedback, here is what I'm using in the 2009 Yamaha V Star 650 & the 2009 Genuine Buddy 125; both will get Shell Rotella T conventional 15w-40 hdeo for the majority of the riding season and get Valvoline 4 Stroke conventional 10w-40 motorcycle oil for late season, winter storage, and early season; Yamaha OCI will be @ 3K miles & Genuine Buddy OCI will be @ 2K miles