I want to change my trans oil. I have been using harley's syn3 in all 3 holes, mainly because they do, but I am thinking of using Royal Purple 75/140 because I can get it in my hood. I would rather use spectro but can't find it anywhere near me. I was wondering what is some of ya'lls opinion of Royal Purple. Tank, I know what you think and I am going to use the amsoil in the engine. Used it in my last bike(Yamaha Roadstar) and was very happy with it. I was thinking the Royal Purple would be better than motor oil in the trans from what I have read here on the forum. Thanks, look forward to hearing from someone who has used the royal purple.