G11 HOAT/IAT confusion

[FCD]

I'm investigating again what coolant to use in my Escort, i've found this which looks appealing.

https://www.repsol.com/imagenes/global/en/max_quality_pure_coolant_antifreeze_tcm14-25160.pdf

" It is free of amines,
nitrites and phosphates"

So it's free from the typical Inorganic additives found in European IAT coolants, except Silicates, which seems appealing as Silicates are for aluminium and my engine has everything but the block made of aluminium.

This to me sounds like a HOAT right? aren't most HOAT's, OAT's with silicates in Europe, and OAT's with Phosphates in Japan?

It doesn't say specifically on the datasheet wether it's IAT, HOAT or OAT, however it meets VW TL744 C, which is a G11 spec, it's also blue like most / all G11s

So we know it's G11, however isn't G11 supposed to be a full IAT, with nitrates, phosphates, amines etc etc included?


I'm debating wether to use this, or a G12++ Si-OAT made by the same company.

 

[FowVay]

If you have access to it then I would definitely use the G12++ or even G13. G13 simply lasts longer and does a better job of preventing corrosion.

 

[FCD]

Kind of worried about issues with lead solder and OATs in a 30 year old cooling system.

 

[Sayjac]

Originally Posted By: FordCapriDriver
Kind of worried about issues with lead solder and OATs in a 30 year old cooling system.

Depending on just how worried, then 'imo' an original/conventional green IAT AF would be absolute "safest" choice. That would have been original spec, at least here. That's easily found here as Motorcraft Premium AF green or an equivalent. Some original green IAT's here are low(er) silicate and have a longer service interval.

Don't know anything about G11/G12, but according to Wolflubes it would be a better choice than G13. That said, don't how authoritative or specifically applicable it would be to the Escort.

https://www.wolflubes.com/EN_EU/Blog/201...nd-coolant.aspx

 

[Trav]

G12+ or G12++ is what you want in that car.

 

[FCD]

I could also get one that is G12+, that claims to have no Silicates, amines, phosphates, nitrates or borates.
Would that be good?

 

[Trav]

Yes that should work well with the aluminum, copper, brass, solder, iron, etc parts in this engine.

 

[FCD]

I think i'mg going to go with G-13, it seems to be just what i want, an OAT with Silicates, but no nitrates, amines, phosphates or borates.

 

[Tikka]

Originally Posted by FordCapriDriver
I think i'mg going to go with G-13, it seems to be just what i want, an OAT with Silicates, but no nitrates, amines, phosphates or borates.


Hi
Have you ever considered the waterless coolants? I have read of them being used in the older classic cars to good effect.
Tikka.

 

[kschachn]

Waterless coolants are an inferior choice for nearly every application. The heat transfer is inhibited, the specific heat capacity is lower, and the freezing point is elevated. For any application with a thermostat there is no upside.

 

[FCD]

There's a channel on Youtube that put Evans Waterless to the test and honestly it did not fare well.

Heat transfer significantly worse than normal coolants, unknown long terms effects on metals.

Sadly a lot of people seem to have bought into it, atleast on the forums and groups i'm in.

 

[Tikka]

Hi Gents
Well, you live and learn. Would be interesting to read some science based evidence for and against.

 

[kschachn]

Originally Posted by Tikka
Hi Gents
Well, you live and learn. Would be interesting to read some science based evidence for and against.

That's very easy for you to find yourself. Just start with the terms that I used in my response. Plain water has the best heat transfer and the highest specific heat capacity, but to improve the boiling and freezing point it is mixed with glycol. A formulated antifreeze brings along corrosion inhibitors and other useful substances. There are many threads here on this site that discuss it in detail.

There are no upsides for any passenger car application with a thermostat.

 

[Tikka]

Originally Posted by kschachn
Originally Posted by Tikka
Hi Gents
Well, you live and learn. Would be interesting to read some science based evidence for and against.

That's very easy for you to find yourself. Just start with the terms that I used in my response. Plain water has the best heat transfer and the highest specific heat capacity, but to improve the boiling and freezing point it is mixed with glycol. A formulated antifreeze brings along corrosion inhibitors and other useful substances. There are many threads here on this site that discuss it in detail.

There are no upsides for any passenger car application with a thermostat.


Yes that is fair comment. I should have said 'will' instead of 'would'.
Tikka.