Howdy! I recently took the MSF safe rider course and got my motorcycle license. I just bought my first bike, a 1999 Honda Magna 750 V4 with 9400 miles. I love it so far! The previous owner ran Valvoline 10w-40 dino it's entire life. Well my Duramax and Honda 400ex seem to love Rotella T6 5w-40, and from what I have read on this site, it seems to be a great choice. My father is an Amsoil nazi and says I am "nuts for running a diesel oil in a motorcycle". I tell him it's a HDEO, and safe for wet cluthes, and JASO approved but he won't budge. Please tell me this oil is okay for my bike! Thanks.