Once upon a time when Snakebitten, EricV, and I wuz kids on Grandpappy Fredz's knees, break-in oil was usually plain old mineral oil with no additives. Some manufacturers do still use a specific oil for break-in, so there could be validity to the question. I just learned that first oil changes in Honda motorcycles show high levels of moly, although that could be assembly lube. But . . .
I called one of the nation's big oil analysis labs for you and asked specifically about what they've found from first oil changes in Yamaha motorcycles. I learned that they have records for private motorcycles and a number of industrial & govt users of Yamaha products, and while I waited the analyst I spoke with pulled up a number of test results to compare. So while this was not a scientifically accurate comparison, his initial gut reaction and then checking records was that their results show nothing unique or different for Yamahas. The specifications for the Yamalube oil they see coming from subsequent oil changes is showing them the same chemistry as from the first oil changes.
Change it and be happy.
I called one of the nation's big oil analysis labs for you and asked specifically about what they've found from first oil changes in Yamaha motorcycles. I learned that they have records for private motorcycles and a number of industrial & govt users of Yamaha products, and while I waited the analyst I spoke with pulled up a number of test results to compare. So while this was not a scientifically accurate comparison, his initial gut reaction and then checking records was that their results show nothing unique or different for Yamahas. The specifications for the Yamalube oil they see coming from subsequent oil changes is showing them the same chemistry as from the first oil changes.
Change it and be happy.