9/13/2023 0 Comments Evans coolant uk![]() ![]() ![]() Unfortunately I picked a name out of my hat instead of heeding the glycol differences. I should've posed the question differently as a comparison of Evans with an undiluted propylene glycol product. Only the mixture in the proper ratio depresses the freezing point to a useful value (-25º to -40✯).Yeah, no question about the benefit of water. If that 'conventional' fluid is ethylene glycol (Prestone is 93% ethylene glycol), you don't want to use it undiluted because the freezing point is about 10✯ - which is nearly useless in most areas where an antifreeze is really needed. My own question would be whether Evans is any better than running your car with pure Prestone (no dilution with water)? In the same breath, I should mention that most jugs of conventional, concentrated coolant warn against using it in undiluted form. If my take on this is wrong, I bet Randy will fix that. Thermal expansion of the liquid state is another matter and occurs to some extent, regardless of the coolant in there, even pure H2O. IOW (as I think I understand it), during normal operation the system with water/glycol mixtures is under 10 times the pressure it otherwise would be with a pure glycol coolant. They are a legacy design that needs to be removed and tossed in the trash.Thanks to the internet, I've learned that the vapor pressure of a water or water/glycol mix in a cooling system is roughly 10-fold (760-800 mm Hg) that exerted by a pure glycol coolant (around 60-70 mm Hg) on the same system at operating temperature of say, 100-110 C. They are a legacy design that needs to be removed and tossed in the trash. I have three cars in my fleet right now with original expansion tanks and over 200K miles. OMG, it's going to explode, so you top up the coolant a bit above the full line (or more), which will cause the pressure to skyrocket and explode the expansion tank. Expansion tanks don't just up and fail, UNLESS YOU OVERFILL.Īt this point I am convince the most dangerous thing you can do to your cooling system is read the forums. There is no excess pressure problem, UNLESS YOU OVERFILL. As was just said in another thread, there is a gob of fear mongering going on. Pretty much every one of these tidbits flies in the face of the accepted forum wisdom. I am still learning new things regularly lots of little Ah-ha's, and the occasional thinking altering discovery. I've been studying the cooling systems (there are three totally distinct designs in the US E39) closely for the last three years. But the few you do find (one of which was an E39), the user ended up draining and going back to water/antifreeze. There's preciously little of this out there. I am looking for a user that has run actual tests. If they can justify $50/liter ATF for an improvement that doesn't come into play until well beyond the warranty period, they could justify this non-coolant. ![]()
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