Thanks for the replies. What exactly is the problem with bio and svo not mixing, as long as I'm using the svo heaters? Do they react to form another compound?
I'd rather not have to use any #2 if I don't have to. I have two tanks on my 87 6.9 idi, so one would always have bio or #2, but on a long trip I'd like to use svo when available. Mike