I have run both the syn 3 and Amsoil in the same motor on the same bike, and you can believe it or not, but with Amsoil the motor runs quieter and cooler than with syn 3...a solid 10-15 degrees cooler on a hot day. I changed to Amsoil, it's easy to get, and I'm sticking with it. $92.35 per case of 12 for the V-Twin oil delivered to my door...that's $7.66 per quart...order one day, receive it the next day drop shipped from the nearest warehouse...don't have to go looking for it...it just don't get any easier than that for me. 'Nuff said...