94 GMC Yukon 6.5l

I'm looking at purchasing one of these with low km's, 65,000 to be exact. I had a trusted mechanic check it out and all the km's pan out with our local air care authorities, so I'm erring on the side of believing it has low km's. Not much in terms of body damage, or underside of the car, etc to suggest much more wear and tear. Either way, I'm curious as to what sorts of fuel other than the basic diesel fuels that I can safely burn in this thing? Biodiesel, veggie diesel with combo biodiesel, etc? I'm new at this diesel thing so any replies are most welcome.