I pulled up the CAT EC-1 MSDS to see what the stuff is made of. It's made by Chevron.

ETHYLENE GLYCOL
92.26
DIETHYLENE GLYCOL
4.61
POTASSIUM HYDROXIDE
2.70


Zerex is made by Valvoline.

Chemical Name CAS-No. Classification Concentration (%)
ETHYLENE GLYCOL
92.26%
DIETHYLENE GLYCOL
4.61%
POTASSIUM HYDROXIDE
2.7%

Ford Gold

ETHYLENE GLYCOL >90%
SODIUM TETRABORATE 1-5%


The formulas are different. However, all are approximately 92% Ethylene Glycol.

Not sure what all this means. There must be some significance to the different formulas.

I have a feeling most of the coolant problems can be eliminated by properly maintaining the system. I am not a believer in 100k interval changes for any consumable product like oil, antifreeze, etc.

 

That is correct.
Ford Gold needs changed at 30k, the others have no cilica and why they don't get changed at 30k.

For the price of coolant (all about the same) I'm going with EC1 rated stuff... and did a couple weeks ago.