Was planning on using Orange anti-freeze
I would advise against using the orange antifreeze. It is intended for late model GM vehicles, and can cause issues with older vehicles, primarily damage to the head gasket (it causes that problem even in engines it's meant to go in), as well as potential chemical reactions with any green antifreeze that may be left in the system. I would suggest using one of the "mix with any" antifreezes that are on the market, Those will be just fine in it. I would also suggest it for replacement in late model GM vehicles, but only a very thorough flushing to remove any traces of the orange antifreeze.
