Duratec coolant?

[mccasksl]

Greetings:

 

What is the general consensus on recommended coolant for mid-late 2000's Duratec? Caterham literature points to Comma X-Stream Red, which I have yet to find in the US. What is everyone else using in the US? To top off existing? To refill after total flush? 

 

Steve

Austin

[MV8]

It's a ford. I would flush, then whatever standard, normal life antifreeze is readily available to me nearby as needed. 50/50 distilled water mix.

[kayentaskier]

When I asked Josh Robbins this question a couple of years ago, he recommended either Zerex Asian or Peak Orange

[CarlB]

This is what Ford recommends. 

HOAT (Hybrid OAT)

Silicates & Organic Acids

Zerex™ G-05™

Ford, Chrysler, European

YELLOW

 

I am not sure it makes a lot of difference if you change it frequently. Zerex also makes coolant that meets all the OEM requirements. 

[oilteq]

Silicates are effective in controlling aluminum corrosion.  Most U.S. passenger car coolants use silicates and phosphates and I think the name brands would do a good job.  HOAT products are convenient if you have a mixed fleet as they also protect against liner cavitation in diesel engines.  I think most of the coolants today use some form of organic acid technology (OAT, HOAT, NOAT).  I have never seen it in writing, but the voice in my head says mixing a modern OAT coolant with the old green antifreeze using an alkaline corrosion inhibitor results in a mixture with less corrosion inhibition than either of its components.

[mccasksl]

Excellent! Thanks for all your input. 
Steve