2008 Roadliner (1,800 cc, air cooled, V-twin, Yamaha power-cruiser). For years I always used the Yamalube, but the price kept going up and a Blackstone report showed it was really nothing special. Dealer started stocking Amsoil price was a few bucks less so that's what I have been using last 4 years or so. No complaints and no noticeable difference in noise vs Yamalube or Motul. I always think I'm going to go for something more boutique, but never happens. Disclaimer; I do an annual change and only seem to get in 1-2k a year these days, so no idea how longer harder use would fair.