Join Date: Aug 2011
Location: Oklahoma Panhandle
I've used the 'Seafoam before oil change' trick in older bikes that have been neglected or sat a long time. I've had the Vulcan since new and been diligent about oil changes and other PM, so it hasn't been as much of a concern for me on this particular bike.
New-looking oil doesn't necessarily mean it doesn't need changing, but is probably a sign you don't need to use Seafoam at this point. From my experience, it won't hurt anything if you want to give it a go.
Regarding fuel system treatment, I've used Seafoam and MMO. Seafoam seems to work better IMHO (though MMO smells better), though I have no quantifiable way to back that. I run a mixed tank through it about every oil change, or if it has sat very long (over winter).
Otherwise, ride often and fill with 87 octane (100% gas, if you can find it in your area). Sitting does a Vulcan no good.