Redline makes a coolant additive called Water Wetter. It's intent is to
improve the contact between the water and interior surfaces of the cooling
system. I use it mixed with Havoline Orange coolant in the  cooling system, as
well as Redline MT90 synthetic oil in the  manual tranny in my 88 GL.

"John W. Parkins" wrote:

> I was talking to a good vanagon mechanic, and he said that they add a
> "coolent additive" when they replace the anti-freeze.  Has anyone heard of
> this? I'm wondering if I should use it as well.  Thanks.
>
> John