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traveler15301 · Posted: Mon Nov 20, 2006 3:38 pm Post subject:

bob h wrote:
Is it compatible with EG?

It has been a while since I checked out the particulars but I seem to recall it is...chemically they are compatible but if you have EG (and H2O as well if it is a mix) you lose a lot of the advantages of NPG by mixing.

I know Evans recommends fluhshing your system with H2O, draining completely then filling with NPG. They then recommend using no pressure on the system so the residual water can evaporate leaving 100% NPG. It has a higher boiling point than 50/50 mix even at 15 psig.

I also put it in my 7.3 ford and they recommend drilling a 1/8" hole in the factory cap...let's the water evap and does not build pressure.

I'm sure you can run it under pressure with no harm (it would actually elevate the bp just like with EG...but why bother...it is already higher!!!), but one of the added benefits is the no pressure situation...less stress on all the involved parts...hoses, seals and especially the water pump.

As I said, my opinions are unqualified and I don't sell the stuff ('though my touting my make it seem so...)....I just checked them out and liked it.

damn near 100k on the pickup and over 200k on the big truck and no problems at all....

If you want the real skinny check out their web site....I don't know how to post links but just google Evans NPG

Birken Vogt · Joined: 29 Nov 2006 Posts: 102

traveler15301 wrote: Precisely the reason to use NPG. It has demonstrated much less (actually near ZERO) cavitation wear than ethylene glycol mix (even with "proper" DCA levels maintained)!

That's what the company that sells it claims anyway.

It contains no water so it has nowhere near the "thermal density" of a correct water containing mix, leading to the possibility of hot spots in the engine. You never can tell without extensive (expensive) factory data so I would not do it.

For me I run Fleet Charge or Chevron Heavy Duty mixed with distilled water from a grocery store. They are conventional the same as green but they have the anti-cavitiation additive premixed so they are pink instead. Low silicate and all that. The best thing is they are cheaper than motor oil now, I think overall cost was $8.00 per gallon last bunch I bought so I do a simple drain and refill the radiator every year, cheap insurance. Nothing to it.

Birken

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