Starting from scratch: 1965 Mustang, what coolant?

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Nov 7, 2014
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Maine, USA
I am rebuilding my old Mustang with a new engine (Ford 5.0/302 cast iron roller cam block with aluminum AFR cylinder heads) and a new aluminum radiator and a new heater core and hoses. Given all of the technological changes to coolant chemistry through the years and this decidedly non-stock build, what kind of coolant should I use when building from scratch? It would be convenient to choose a chemistry that is available through the aftermarket such as Prestone or Zerex, but which long-life formula would be best - HOAT, OAT, P-HOAT, etc? My 2016 Ford F150 uses Motorcraft Specialty Orange which seems to be somewhat similar to the GM DexCool, and my wife's Mazda CX-5 uses a long-life Asian FL-22 formula. I don't necessarily need to match with either vehicle, but I would like to choose the best long-life formula for my car and am open to any suggestions. If you were starting from scratch what would you use? Thanks, Greg
 

Kestas

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Zerex G05. There are no soldered components because you switched to an aluminum radiator, so the old school green antifreeze is out. You don't know how Dex-cool would affect the gaskets in your setup, so that is out.
 
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Wow. I've never seen such a unilateral response on any thread here on BITOG previously.. this is amazing. That said, I agree that G05 is a perfect choice in this application. Cheap, easy to find, and top notch.
 

Minorgroove

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Maine, USA
I want to thank everyone for the fast and nearly unanimous opinions! Thank you so much for your insights. Best, Greg
 

Kestas

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Originally Posted By: SirTanon
Wow. I've never seen such a unilateral response on any thread here on BITOG previously.. this is amazing.
Probably a BITOG first.
 
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