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I'm giving it a try. I don't have any results to report, but from the website it appears that it significantly increases the boiling point of the coolant thereby reducing boil off. It also reduces the viscosity to allow better flow of the fluid throughout the engine (similar to Water Wetter). According to Evans, it doesn't reduce the engine temperature.

Water Wetter is a supplement to the coolant currently used in most cars (ethylene glycol). NPG+ (propylene glycol) is a complete coolant replacement with much improved properties.

I understand that Sean Roe has experience with this stuff in racing applications.
 

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to me it just looks like a coolant that allows you to run a race engine at higher temps and really has no benefit for street use.
 

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Discussion Starter · #8 ·
This is off of the top of my head, I need to brush up on this.

Evans NPG+ has a much higher boiling point than straight water, water/antifreeze/coolant mix.

This allows you to run it without a high pressure rad cap which lessens the stress on hoses, waterpumps etc. Also less chance of a leak from the pressure.

Only drawback I know of after using it is that it must be put in without any water/af/coolant mix in the engine at all.

I think it should be read up on more because I can not give you all the info on it. You might be suprised at what you find out about it.



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NPG is great stuff for a race car, but I don't consider it practical for a street car. It can't be mixed with any water, so your entire cooling system, including engine, must be completely evacuated of water.
Also, what happens when you blow a radiator hose out in the middle of nowhere? Billy Bob's Pork Rind Emporium and Auto Parts ain't gonna have any NPG.
Also, we stopped using Water Wetter a few years ago after discovering Royal Purple Super Coolant Additive. In our street and race cars, we could see an 8-10 degree decrease on a real coolant temperature gauge, whereas we saw virtually nothing with Water Wetter. Royal Purple additive really works! (And of course, I carry it in stock...)
 
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