Is the Popemobile diesel? If not, should it be?

I was just wondering. Up close photos shows it was made by Fiat. Anybody know what kind of power that baby is making? It looks like a small Jeep type vehicle. I'm guessing its a small diesel possibly a V-6 or and inline 6. If I could redesign the Popemobile I would make it out of a 3500 Silverado Dually with the 6.6 L Duramax turbo diesel and Allison transmission. I think the Pope deserves a REAL man's ride, don't you?