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G11 HOAT/IAT confusion #4849328 08/24/18 02:12 AM
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FordCapriDriver Offline OP
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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.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849334 08/24/18 02:38 AM
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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.

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849344 08/24/18 03:38 AM
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FordCapriDriver Offline OP
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Kind of worried about issues with lead solder and OATs in a 30 year old cooling system.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849380 08/24/18 06:00 AM
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Sayjac Offline
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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



Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849397 08/24/18 06:46 AM
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Trav Offline
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G12+ or G12++ is what you want in that car.


ASE L1, Master. Deutsch Meisterbrief.
Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849417 08/24/18 07:20 AM
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FordCapriDriver Offline OP
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I could also get one that is G12+, that claims to have no Silicates, amines, phosphates, nitrates or borates.
Would that be good?


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4849818 08/24/18 03:23 PM
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Trav Offline
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Yes that should work well with the aluminum, copper, brass, solder, iron, etc parts in this engine.


ASE L1, Master. Deutsch Meisterbrief.
Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4852140 08/27/18 09:00 AM
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FordCapriDriver Offline OP
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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.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4869280 09/15/18 10:35 AM
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Tikka Offline
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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.

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4869281 09/15/18 10:39 AM
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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.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4869285 09/15/18 10:53 AM
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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.

Last edited by FordCapriDriver; 09/15/18 10:54 AM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: G11 HOAT/IAT confusion [Re: FordCapriDriver] #4871086 09/17/18 12:49 PM
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Tikka Offline
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Hi Gents
Well, you live and learn. Would be interesting to read some science based evidence for and against.

Re: G11 HOAT/IAT confusion [Re: Tikka] #4871120 09/17/18 01:35 PM
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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.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: G11 HOAT/IAT confusion [Re: kschachn] #4871321 09/17/18 06:25 PM
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Tikka Offline
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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.

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