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Got rid of the corrosive orange and went with the Peak 10X.  Why?  Because Ford put out documentation to flush it out and replace it with yellow.

 

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I have read a lot about changing it out on the 2.0, but could not find anything on the 2.7.  Does that apply to the 2.7 as well, as I have the orange looking in my ST.

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I bought a kit similar to this in preparation for the supercharger installation on my Mustang. 

Vacuum Cooling System Filler Kit

I'm glad I did as it made the refill process of the cooling and intercooler systems a breeze. It's nice knowing your system will be 100% filled and purged of all air in minutes without having to start the vehicle. 👍

Edited by handfiler

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20 hours ago, macbwt said:

Got rid of the corrosive orange and went with the Peak 10X.  Why?  Because Ford put out documentation to flush it out and replace it with yellow.

 

Would you mind sharing the exact documentation from Ford or where it can be found?

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The orange is NOT corrosive.  Ford does NOT recommend replacing the orange with yellow early.  The yellow has double the service life of the the orange, which is why the orange was replaced with the yellow.  There is NO need to run out and flush the orange out of the vehicle.

 

Yellow/Orange Coolant Backwards Compatibility

Edited by todd92
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45 minutes ago, todd92 said:

The orange is NOT corrosive.  Ford does NOT recommend replacing the orange with yellow early.  The yellow has double the service life of the the orange, which is why the orange was replaced with the yellow.  There is NO need to run out and flush the orange out of the vehicle.

 

Yellow/Orange Coolant Backwards Compatibility

That's also  my understanding.

 

Same discussed here:

 

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