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Re: Removing old Antifreeze by dilution [Re: FordCapriDriver] #5007704
02/11/19 08:26 AM
02/11/19 08:26 AM
Joined: Apr 2010
Posts: 454
Holly Springs, NC USA
jim302 Offline
jim302  Offline

Joined: Apr 2010
Posts: 454
Holly Springs, NC USA
Originally Posted by FordCapriDriver
What inhibitor package does CorGuard use?


Appears to be a P-OAT. SDS shows 2-Ethyl Hexanoic Acid and the latest PQIA analysis shows Phosphate. There are most likely other corrosion inhibitors as well. It should offer better protection than conventional Dex-Cool or clones since the phosphate will provide fast acting corrosion protection. It seems fine to me, though I always thought the 2-EHA concerns were way overblown.

Re: Removing old Antifreeze by dilution [Re: Snagglefoot] #5007775
02/11/19 09:42 AM
02/11/19 09:42 AM
Joined: Oct 2015
Posts: 2,885
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 2,885
Balearic Islands , Spain
From what i've been able to gather the concerns over 2-Eha are true, it corrodes Solder ( specially High lead ) unless there is also Molybdate present.
Rubber components not designed to deal with it also suffer.

One coolant that is very interesting is G64, it's a PSi-OAT, in other words an OAT coolant with Phosphates and Silicates, which may or may not have 2-Eha depending on the particular brand you buy ( look for it i the SDS if you want to know if a particular coolant has it or not ), i made a thread on it not long ago and apparently it's sold in the U.S as Zerex Original Green which is interesting.

Sadly it's not available here in Spain, if it were i would be using it, for the meantime i am using G40 Si-OAT which in my opinion is better than P-OAT, Silicates offer much better protection to Aluminium than Phosphates, it is true that Phosphates provide Cast Iron protection but Cast Iron is not a fussy metal at all and it is protected by the Organic Acid inhibitors more than adequately.


Last edited by FordCapriDriver; 02/11/19 09:53 AM.

1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Both on G40 Si-OAT coolant.
Re: Removing old Antifreeze by dilution [Re: Snagglefoot] #5008162
02/11/19 04:25 PM
02/11/19 04:25 PM
Joined: Mar 2016
Posts: 1,842
Western S.C.
CR94 Offline
CR94  Offline

Joined: Mar 2016
Posts: 1,842
Western S.C.
Originally Posted by Snagglefoot
Originally Posted by CR94
I used to do a variation of that tedious routine, but worried that running that long on plain water might damage the water pump seal. Antifreeze supposedly contains (or acts as) seal lubricant. Any expert opinions on that issue?
30 minutes of running with water?
Likely longer than that overall, by the time you warm the engine enough for the thermostat to open, and do so several times with cold water.


2011 Toyota Prius now at 96K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Removing old Antifreeze by dilution [Re: FordCapriDriver] #5008528
02/12/19 05:45 AM
02/12/19 05:45 AM
Joined: Dec 2017
Posts: 3,731
SE British Columbia, Canada
Snagglefoot Offline OP
Snagglefoot  Offline OP

Joined: Dec 2017
Posts: 3,731
SE British Columbia, Canada
Originally Posted by FordCapriDriver
From what i've been able to gather the concerns over 2-Eha are true, it corrodes Solder ( specially High lead ) unless there is also Molybdate present.
Rubber components not designed to deal with it also suffer.

One coolant that is very interesting is G64, it's a PSi-OAT, in other words an OAT coolant with Phosphates and Silicates, which may or may not have 2-Eha depending on the particular brand you buy ( look for it i the SDS if you want to know if a particular coolant has it or not ), i made a thread on it not long ago and apparently it's sold in the U.S as Zerex Original Green which is interesting.

Sadly it's not available here in Spain, if it were i would be using it, for the meantime i am using G40 Si-OAT which in my opinion is better than P-OAT, Silicates offer much better protection to Aluminium than Phosphates, it is true that Phosphates provide Cast Iron protection but Cast Iron is not a fussy metal at all and it is protected by the Organic Acid inhibitors more than adequately.



You should phone them up and discuss their patents, and their claim on the bottle that they have 5 times more effective engine protection. Somehow I seriously doubt Prestone is running chemicals that damage solder or that their product damages any engine’s rubber especially with their claim it is a mult-vehicle product. Anyway, I have used Prestone branded anti-freeze for years and have never had any corrosion in any of my engines or solder or rubber failures, so I am good to go. Thanks for your posting.
smile

Last edited by Snagglefoot; 02/12/19 06:07 AM.

If you want the job done right......do it yourself.
Re: Removing old Antifreeze by dilution [Re: Snagglefoot] #5008738
02/12/19 10:48 AM
02/12/19 10:48 AM
Joined: Dec 2017
Posts: 3,731
SE British Columbia, Canada
Snagglefoot Offline OP
Snagglefoot  Offline OP

Joined: Dec 2017
Posts: 3,731
SE British Columbia, Canada
And here is the final measurement of the new mixed coolant. Looks like -45 F which is about 55% coolant.

2D907F9F-89E9-476F-AA0A-D4147416C9DC.jpeg
Last edited by Snagglefoot; 02/12/19 10:52 AM.

If you want the job done right......do it yourself.
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