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So in the 6.0L world, Ford Gold coolant was a known no-no. I ran CAT ELC for years happily.

What's the recommended coolant for a 2015 6.7L? Even more fun, I see I have a pair of cooling circuits to flush LOL
 

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Motorcraft only for me.
 

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DEX Cool is ok. Or any coolant that meets or exceeds the requirements of WSS-M97B44-D, GMW 3420 (superseded GM 6277M) and ASTM D 3306 per the Motorcraft site.

https://www.fcsdchemicalsandlubricants.com/main/product.asp?product=Orange Concentrated Antifreeze/Coolant&category=A/C and Engine Cooling Products

I am wondering if the New Motorcraft/Ford Yellow coolant used in the 2018 and newer 6.7's can be used if you do a flush and fill. It has a 10 year/200,000 mile life.

https://www.fcsdchemicalsandlubricants.com/main/product.asp?product=Yellow Concentrated Antifreeze/Coolant&category=A/C and Engine Cooling Products
 
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image-2019-12-14-00:11:42-249.jpg

Autozone, $20 and file quick online rebate for $5 every gallon you buy. So all in all, their $15 after it’s all said and done. And ford allows it. Already checked.


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Motorcraft VC-3DIL-B that’s what comes factory in your truck, that’s what I would only use!
 
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