The information that we have received is that the bike takes REAL synthetic oil. The emphasis on REAL is because most 100% synthetic oils are not synthetic oil at all. So, you can use Yamalube synthetic ester or Motul or Redline, etc. Just be aware that it is almost impossible to know which oils contain 100% synthetic base stock.
For example Mobile 1 is no longer actually 100% synthetic oil.
If interested, this link provides a detailed review of the current state of synthetic oil advertising and sales.
For example Mobile 1 is no longer actually 100% synthetic oil.
If interested, this link provides a detailed review of the current state of synthetic oil advertising and sales.