John,
The Evans Coolant is a waterless coolant. Being a waterless coolant, there is no byproduct of steam. Which means no pressure, this is a non-pressurized system. You cannot mix Evans with water. They are not compatible. I found them through a friend of mine and wish I would have known about them a long time ago. There are some things you'll need to upgrade, water pump, radiator cap and their flush to remove all the water in your system. This is a great system and there are several other guys using it. The other thing I really like about Evans, there's no water so there will be no rust! Enjoy...
Chris,
slithering
