Ok..I bought 4 syn3 qaurts before I started reading the forum. Through the conversation with you all, I decided to go with Mobile1. But when I tried to return the syn3...OH MY GOSH. They stated that syn3 is the only thing you should be using. If something should go wrong with your motor they may not cover it under warranty. I under stand HD is trying to run a business and make money, but, it's hard to convince me that a better oil for my bike that cost the same would not be covered. "PLEASE" The only thing that I would like to know is does anyone have a clean way of removing the oil filter without making a mess. I used a plastic bag and removed it and did pretty good but I am open for anymore ideas. By theway my new bike is the proud owner of Mobile1 v-twin.