RE: {Chrysler 300} Evans Coolant

Gary,

Full strength propylene glycol is what Evans is. Based on what you’re saying even Evans would eventually need changing due to Glycol degradation. There seems to be no end to opinions on coolant and/or additives. I just want something that works with iron, brass, lead (solder) and aluminum that lasts at least 5 years between changes.

Bob

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Gary
Sent: Tuesday, September 9, 2025 2:47 PM
To: Bob Jasinski <rpjasin@xxxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} Evans Coolant

Hi Bob and All.

A pressurized automotive cooling system using “propylene glycol” full strength is approximately 370.8°F (188.2°C). 50/50 mix of propylene glycol and distilled water with Pressurized system boiling point: ~250–265°F (121–129°C). Has a Freeze protection: Down to ~-29°F (-34°C). O'Reilly Auto Parts sells Sierra brand full strength propylene glycol for $28 gal. You need to adjust PH occasional with DOWFROST™ pH Booster or similar. Drain every 3 to 5 years. I recommend using a “water Wetter” that aids in cooling.

Even a well-maintained propylene glycol (PG) coolant system with a stable pH of 8.0 to 8.5 will eventually need to be changed. The key reason? Glycol degradation over time, which leads to acid formation, even in closed-loop systems.

Evans could be a smart long-term investment—if you're willing to do the full conversion. Otherwise, a high-quality PG coolant like Sierra or Engine Ice offers excellent safety and performance at

half the cost and effort.

Gary

I’m giving serious thought to changing over to Evans coolant in my G. I’ve read a lot about it and really like that it is a permanent solution to avoid coolant changes, eliminate cooling system corrosion, and reducing system pressure due to its high boiling point of 375 degrees F. I am aware that the conversion requires removal of all the old coolant and that the system has to be purged with a product made for doing that. I’m also aware that Evans is about $50/gallon so the conversion would come close to $300 altogether. Does anyone here have any experience with Evans coolant? I’d like to hear from those that have actually used it, and if you were happy with it or not. If not, what problems did you have?

300ly,

Bob J

Danville, CA

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