Coolant/Antifreeze (Not OAT or HOAT) 10.1L      Propylene based Anti-freeze is ideal.

Beware if your van is standing for a long time without antifreeze and just water. It can damage your engine if it freezes.

Stuart Whittell found a nice crack in his cyl. head when he removed the coolant pump.

He did manage to get it repaired.