I ran auto oil in an 01 vulcan classic I had. never had any issues with it. however, I decided rather than put myself through concerns/worry/wondering, etc, I just decided that it wasn't that much of an investment to run synth MC oil. Heck, the hawk only uses about a quart at oil change. what's 10 bucks to feel comfortable with what you use? my clutch/oil actually seems to be running better (cooler) based on how my clutch was grabbing when in hot stop/go traffic. Now that I'm using synth, never a problem. I'm only around 800 miles on the hawk so far, but it seems to be settling in very nicely. by that, I mean I run the pi$$ out of it and it doesn't break.
