coolant mixture ratio

RickB · Jan 5, 2008

joe48 said:
C) This is correct the glycol does slowly decompose into glycolic acid , which then lowers pH and causes corrosion and consumes the additves. If the Ph and % glycol are monitored and kept up by adding glycol or corrosion additves the glycol can last almost indefinitly, at least in HVAC situations.
In automotive applications it's just cheaper and easier to change the AF every 3-4 yrs. Also a side note; most auto applications still use ethylene which is poisonous , HVAC almost exclusively uses propylene because it is NOT poison and is environmentally friendly. Propylene is used in many food products, just without any additives.

Antifreeze formulation recommendations for most diesel engines differ from automotive applications due to increased electrolosis and cavitation erosion of wet sleeves and parent bore engine blocks caused by increased combustion pressures and other factors. Advising that MOST automotive antifreezes are compatible with each other ignores those that aren't along with the pitfalls of that oversight. Recommendations for HVAC applications probably have little or no relevancy to this discussion.

joe48 · Jan 5, 2008

Q)
Antifreeze formulation recommendations for most diesel engines differ from automotive applications due to increased electrolosis and cavitation erosion of wet sleeves and parent bore engine blocks caused by increased combustion pressures and other factors. Advising that MOST automotive antifreezes are compatible with each other ignores those that aren't along with the pitfalls of that oversight. Recommendations for HVAC applications probably have little or no relevancy to this discussion.

As I said you need to check the manufacturers recommendations, and yes there are always exceptions to the rules. You should always make sure that the AF meets the tractor mfg specifications. Yes diesels typically are more difficult conditions because of heat, metallurgy,etc, again thats why you need to match the mfg's specs.