The question of what low phosphate/silicon anti-freeze comes up
repeatedly along with the quality of the water to mix with it.  For our
Vanagon engines, with their cooling systems, this is an important issue.

Across the country, and Canada as well, and I suspect Europe also, the
John Deere agricultural tractor and equipment dealers carry a
water/antifreeze coolant which meets the necessary specifications of no
phosphate/silicon, is pre-mixed with demineralized water, and in short
is just what the Vanagon needs.  They also sell an anti corrosion/water
pump lubricant package with this coolant, and you add it according to
the total volume of the system.

Farm equipment engines are much more expensive than our Vanagon engines,
and have much the same requirements for the coolants.  That's why a
special coolant package is offered.  I think most of us know where a
dealership is located within a reasonable distance.

I even use it in my John Deere equipment, it's that good!

Chuck Hill