Anyone use Evans NPG+?
 

I was wondering what experience you have with this coolant or what do you think about it. It seems like a lot of people use it on other cars but I haven't heard anybody using it on BMW.

Since we have so many problems with the cooling system I thought this might be an answer.

Home Engine Cooling Systems

Waterless Engine Coolant, interesting. I'm curious too if anybody's tried it. Wonder how much that stuff costs?

weird

Would want to know the PH level and if it is phosphate free due to the metals and plastics used in our systems.... if it is all in sync and compatible it would be some good stuff to switch to during some maintenance or repairs. But it will be all but impossible to get 100% of the old stuff out because of things like the oil coolers and heater core etc. so it will have some "water contamination" in it.

Check this out.
I did it! A zero pressure cooling system. - bimmerfest - BMW Forums

So the dude has now been using it for 2 weeks without problems. Not exactly a long term test yet...

Interesting stuff. Another question off topic. Why do people worry about the fan clutch as noted in that other forums thread? Do they fail abruptly, and is there a specific cause?

120 dollars for 4 gallons

That isn't a zero pressure system.... It is a waterless, but not zero pressure as it is still closed with a 1.4 bar cap. (which is about 20 psi) The pressure in a cooling system is from the expansion rate of the metal in the engine, not from coolant boiling. I have not yet seen a "no pressure system" in my life, not even on my old '69 F250. Basically if it has a sealing cap it has pressure when above room temp.



**edit** I have seen a no pressure system, and it is waterless as well. Volkswagen beetle.

so i guess what is really going on is that there is no pressure being applied to the cooling system due to the expansion of water...seems the relief in pressure within the cooling system would extend the life of radiators and hoses since the heat cycles wouldnt have the associated pressure cycles...seems worth keeping an eye on how dude makes out in the long run.

Though I've not personally used this, it is used extensively by several other people I know. A lot run highly modified turbocharged cars, some off-road vehicles, and the like. It works very well. It will not boil over, even at 300*F temp. You do not need to run a pressurized cap with it - just a cap without a pressure seal is fine, or no cap at all.

Though it is expensive, it does work, and I'll be using it when I put the new radiator into my project franken-Volvo this summer.

Hadn't thought about using it in the BMW - but...it does make sense...since our plastic bits are so prone to explode after time. The lack of 20psi of pressure inside the system would probably extend their life almost indefinitely.

It's good stuff. Been around for years. It's an additional layer of protection.

One thing to consider is that pressure isn't the only factor with the plastic components, the PH level or the coolant and temperature are what break down the plastic over time. I can't tell you how many plastic hose ends I've seen at work turning brown and feeling like wet cardboard on the inside that weren't leaking yet. That affect was from years of heating and cooling with the acidity of the coolant wicking the oils out of the plastic etc.