I had the shop put Amsoil in at the 600mile oil change and I will say that the Spyder has never been smoother and more responsive. The transmission shifts smoother and faster, the engine sounds so much better and throttles more responsively in a smoother manner. I was skeptical until I read their Motorcycle White Paper and when put up against 17 other oils it rates higher cumulatively over many of their tests when compared to the competition. I think I am getting better gas mileage, but haven't tested it to prove it, but I seem to be going farther between refills. I'm not a dealer or anything, but I signed up as a Preferred Customer to buy it at wholesale and I am very happy with their oil and Power Shot gas enhancer. Be careful when choosing Castrol RS R4 AT, Spectro Plat SX4, Bel-ray EXS Superbike; according to their test they fail miserably in rust protection which is important for the winter months when the Spyder sits. The picture they show of Castrol RS R4 4T is disgustingly corroded. Bel_ray & Lucas oil also foam horribly. Lucas Oil & Royal Purple has the worse Volatility (Evaporation) (ASTM D-5800) at 18.68%.
Motul ranked 6th out 15 with a score of 75. Amsoil Ranked #1 with a cumulative score of 31. Royal Purple ranked 14th with a score of 93. Pennzoil was last place ranked 15th with a score of 111.
Here is a link to there White Paper on Motorcycle oils
http://www.amsoil.com/lit/g2156.pdf . It was very educational and helped me understand what makes an oil better than another. Amsoil is not the cheapest, but it is also not the most expensive. If you go that route sign up as a preferred buyer and get it for wholesale. They ship to your door normally in 2-3 days depending on your location to a distribution center and there shipping rates are very low considering the weight of the shipments.
YMMV :2thumbs: