Hello to all: Last year I did an engine ungrade to my 2002 fatboy. Went from 88" to 95". New cams,harley roller chain conversion kit and heads port and polished. Vance Hines big shot exhaust. My engine builder used dino 20/50 oil (Castrol) and sugested I stay with it. My last oil change I went with Harley 360. I was thinking about using synthetic after reading everything on the forum. I only put on a few hundred miles since the rebuild. I am hearing pros and cons . What do you guys think. Thanks