that is adddressed clearly right on the side of a bottle of Water Wetter..
they site a dino test ,
using plain water,
plain water with water wetter,
50/50 a-frz mix,
and that mix with water wetter.

water with water wetter cools best..
they also mention that an anti-frz misture of less than 50/50 ( less
a-frz ) cools better than 50/50.

it works too.

had this happen ..
85 Adventurewagon , 2.1 waterboxer engine stock 1.9 cooling system ..
but I added the 2.1 type oil cooler..
and water wetter..
went on a 1,500 or so mile trip ..
my temp needle was glued dead in the middle of the temp gauge scale ..
hills or speed didn't make the needle budge.
On 7/3/2014 2:05 PM, Don Hanson wrote:
> Water Wetter does work.  I used it in my racer, also and when the cooling
> system is maxxed out, it raises the Max a significant amount.
>     Vanagons usually don't have an over heating problem...unless something
> isn't quite right...In that situation, Water Wetter might be worthwhile,
> but normally they seem to cool just fine without it.   Can't hurt, I
> guess...but at the track you aren't running glycol
> antifreeze/coolant...usually just water is required...so water wetter has a
> real purpose...it helps plain water exchange heat better...in an antifreeze
> mix, probably not so much..
>
>
> On Thu, Jul 3, 2014 at 4:48 PM, Michael Magnani <mfmagnani@sbcglobal.net>
> wrote:
>
>> I followed with interest the illuminating thread regarding vanagon cooling
>> systems and I'd like to pose one more question. Has anyone used Redline
>> Water Wetter in their WBX? We use it in the Sprint Car I crew on, as do all
>> the other racers in the pits. Granted, we're running a 700 HP, 360 cu in
>> Chevy V8 that runs on alcohol, but the concept is the same: improving the
>> efficiency of the cooling system. Any thoughts or opinions?
>> Mike M
>>
>> Sent from my iPad