Quote:
Originally Posted by '97ventureowner
The first paragraph is great advice and what I have told my customers over the years. By keeping the level up in the reservoir , it keeps excess air out, which can cause issues. The second paragraph though needs a little clarification. The problem arises when people talk about "green coolant". The old standby green coolant(non OAT) used in practically all 20th century vehicles has a different protection package than Dex Cool does. Like you said, by mixing the old green coolant , you negate the positive effects of Dex Cool's protection for your engine. There are newer, OAT based coolants like Dex Cool that can be safely mixed that also have a green coloring to them. These too are called "Extended Life Coolants". The problem is the colors of both are green, and not many people realize there is a big difference, and tend to get the older stuff as it's generally much cheaper in price.
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Yeah my point was you could mix the old green with Dexcool and it wouldn't cause any compatibility issues, but like you said you would not get the same level of protection and you would no longer have extended life protection. The only problem with Dexcool is not being tolerate of air, so as long as you have a prerssurized reservior it gives the best protection.