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Glysantin G64 PSi-OAT #4997731 02/01/19 12:03 AM
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FordCapriDriver Offline OP
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I've been reading up a lot on coolants since about September, but i hadn't even come across this stuff before.

https://www.glysantin.de/en/glysantinr-g64r-concentrate

Glysantin call it a PSi-OAT , a.k.a, Phosphates + Silicates + OAT

Ph seems average for a typical OAT, between 7.5 - 8.5, but with a high reserve alkalinity ( 8-10 ) , apparently it's dyed dark green.

It seems like it's mostly meant for heavy duty diesels.

What do you think?

Last edited by FordCapriDriver; 02/01/19 12:09 AM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4998278 02/01/19 11:41 AM
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nthach Offline
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It's sold in the US as Zerex Original Green, but it also claims a 10/100K service life due to the OAT addition. I've used it before in a Nissan and I would use it in an application that uses old school green.

Re: Glysantin G64 PSi-OAT [Re: nthach] #4998478 02/01/19 01:49 PM
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Originally Posted by nthach
It's sold in the US as Zerex Original Green, but it also claims a 10/100K service life due to the OAT addition. I've used it before in a Nissan and I would use it in an application that uses old school green.


Really?? wow, it seems like a great coolant.

I use G40 which is very similar but pink and without phosphates in the place of conventional green in my two old Fords.

Last edited by FordCapriDriver; 02/01/19 01:50 PM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4998514 02/01/19 02:09 PM
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nthach Offline
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I stand corrected - it's a 5yr/100k coolant like Dex-Cool/G-05, but it's still an upgrade over conventional green while being compatible with it.

https://www.valvoline.com/our-products/antifreeze-products/zerex-original-green-antifreeze

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4998525 02/01/19 02:15 PM
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FordCapriDriver Offline OP
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It sure is an upgrade.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4999329 02/02/19 10:25 AM
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mightymousetech Offline
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Interesting. Guess you can mix phosphated and silicated OAT?


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Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4999446 02/02/19 12:07 PM
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I always wondered how Zerex could claim 5yr/100K ability on a 'conventional' coolant....now I know...thanks nthach...


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Re: Glysantin G64 PSi-OAT [Re: mightymousetech] #4999542 02/02/19 02:18 PM
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Originally Posted by mightymousetech
Interesting. Guess you can mix phosphated and silicated OAT?


Phosphate and Silicate both being conventional inhibitors should not have any problems i guess mixing with eachother.

I'm going to research if i could possibly get some of this G64 here in Spain, the Phosphates should add some cavitation protection and improve cast iron corrosion.

Last edited by FordCapriDriver; 02/02/19 02:20 PM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4999553 02/02/19 02:31 PM
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Phosphates are there to quickly protect aluminum from what I understand - which is why the Japanese favor them and traditional green uses them. Silicates were more for ferrous metals. OATs do take a while to passivate and setup.

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4999703 02/02/19 05:08 PM
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mightymousetech Offline
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Originally Posted by FordCapriDriver
Originally Posted by mightymousetech
Interesting. Guess you can mix phosphated and silicated OAT?


Phosphate and Silicate both being conventional inhibitors should not have any problems i guess mixing with eachother.

I'm going to research if i could possibly get some of this G64 here in Spain, the Phosphates should add some cavitation protection and improve cast iron corrosion.


Just mix Honda and BMW coolants. wink


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Re: Glysantin G64 PSi-OAT [Re: nthach] #4999983 02/03/19 02:58 AM
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Originally Posted by nthach
Phosphates are there to quickly protect aluminum from what I understand - which is why the Japanese favor them and traditional green uses them. Silicates were more for ferrous metals. OATs do take a while to passivate and setup.


Quite the opposite! , Silicates are by far the best corrosion inhibitor for Aluminium components.... everybody but the Japanese agrees on that, Phosphates are primarily used to inhibit Cast Iron corrosion, and also reduce cavitation.

Silicates started to be used in the 80s, when engines began using Alu cylinder heads, they found the traditional Phosphate, Borate, Azole etc formulations did not protect them well.

OAT coolants do take longer to activate, but they do not Passivate anything like Silicates or Azoles and Phosphates do, they only act wherever there is corrosion happening, if there is no corrosion occurring, they stay sort of "inactive"

Last edited by FordCapriDriver; 02/03/19 03:00 AM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #4999985 02/03/19 03:04 AM
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I don't have pictures right now to show you, but Years of using a Phsophate / Borate conventional coolant ( No silicate ) did quite some damage to my Ford Capri's water pump, thermostat housing and intake manifold ( all the aluminium components )
All were badly pitted and the coolant had literally eaten chunks out of them.

Now it has a new water pump, thermostat housing and i am using G40 Silicate OAT coolant in it.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #5001243 02/04/19 12:42 PM
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Weird - the cooling system passages look pristine with Toyota phosphated coolant. I've seen pitting with everything else though.

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #5001690 02/04/19 11:49 PM
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Coupled with an OAT inhibitor it probably does a perfectly good job, however a plain jane Phosphate / Borate conventional coolant doesn't do to well from personal experience with alu engine parts


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Glysantin G64 PSi-OAT [Re: FordCapriDriver] #5002013 02/05/19 12:43 PM
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Originally Posted by FordCapriDriver
Coupled with an OAT inhibitor it probably does a perfectly good job, however a plain jane Phosphate / Borate conventional coolant doesn't do to well from personal experience with alu engine parts

Honda and Toyota are against the use of borates as they believe it causes pitting of Al components. An old Lexus I had used nothing but Toyota red coolant and when I pulled the water pump everything looked great.

Toyota had a sell sheet about why their coolant should always be used, I found one for Hino, same spiel: http://www.hino.com/assets/lt-0003-hino-coolant-2010.pdf

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