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G11 and G48 interchangeable? #5234536 10/09/19 07:01 AM
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FordCapriDriver Offline OP
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One thing that has me wondering lately, i am looking at possibly buying a 1991 Ford Escort RS 2000 ( European 150hp version )
Looking at fluid recommendations for it i noticed :
The recommended coolant is Ford ESD-M97B4-A

A quick search shows most of the coolants meeting this spec are Blue and claim to meet either VW G11 or G48, or both at the same time.

However, G11 is supposed to be a plain IAT containing Silicate, Borate, Benzoate and some form of Azole.

G48 on the other hand is a Silicate HOAT with no borate ( or benzoate? )

I am confused about how these coolants can be considered interchangeable or meet both specs at the same time?


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 and G48 interchangeable? [Re: FordCapriDriver] #5234672 10/09/19 09:10 AM
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I don't know the specs but decide on one then do a complete flush if worried about the compatibility .


2015 F150 2.7
2018 F350 6.2
Re: G11 and G48 interchangeable? [Re: FordCapriDriver] #5234874 10/09/19 12:32 PM
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nthach Offline
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Sodium benzoate is an organic acid, and also found in G-05. G-05 uses borate as well to protect cylinder liners, while azole is there to protect copper.

G-11 is VW's old school coolant before G-12(G-30) was used. G-48 is 2-EHA.

In theory, all OATs should play nice with each other but not always.

Re: G11 and G48 interchangeable? [Re: FordCapriDriver] #5234876 10/09/19 12:34 PM
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nthach Offline
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Also, G-05 has nitrite as well which is why Ford and Daimler was fond of it for diesel applications.

Re: G11 and G48 interchangeable? [Re: nthach] #5235638 10/10/19 08:32 AM
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FordCapriDriver Offline OP
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Originally Posted by nthach
Sodium benzoate is an organic acid, and also found in G-05. G-05 uses borate as well to protect cylinder liners, while azole is there to protect copper.

G-11 is VW's old school coolant before G-12(G-30) was used. G-48 is 2-EHA.

In theory, all OATs should play nice with each other but not always.


Borate used to protect cylinder liners? you sure about that?
The only use of Borate in a coolant that i know of is that it acts as a pH buffer, it doesn't have any corrosion inhibitor properties that i know of, in fact it's well known to be aggressive towards aluminium.

Also about 2-Eha being present in G48, i do know of one particular G48 coolant made by a brand called AD that doesn't have any mention of 2-Eha , at least in the SDS, other brands like Glysantin do seem to mention it in the SDS.

So what i understand is that G11 uses Sodium Benzoate as the OAT inhibitor and G48 uses 2-Eha and / or something else depending on brand?

Last edited by FordCapriDriver; 10/10/19 08:35 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 and G48 interchangeable? [Re: FordCapriDriver] #5235876 10/10/19 12:38 PM
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nthach Offline
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You might be right about borate being a pH buffer - and the reason why the Japanese frown upon borate for pitting. I thought it was a component used in HD coolants to help protect wet-sleeve cylinder liners like what's found on bigger diesels.

The labels on BMW coolant in the US state 2-EHA. As long as the coolant itself or the add pack is coming from BASF it will have 2-EHA. In the US, BASF doesn't sell the Glysantin brand, Valvoline sells all the G-xx stuff under the Zerex label.

Re: G11 and G48 interchangeable? [Re: FordCapriDriver] #5236716 10/11/19 08:44 AM
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FordCapriDriver Offline OP
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If 2-Eha is present in a coolant is MUST be in the SDS ( Safety Data Sheet ) of the coolant correct?

Last edited by FordCapriDriver; 10/11/19 08:44 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 and G48 interchangeable? [Re: FordCapriDriver] #5237086 10/11/19 02:44 PM
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nthach Offline
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A formulator/distributor can leave any non-hazardous or trade secret ingredients out of the SDS. 2-EHA is a hazardous chemical but in the concentrations used it can be left out of an SDS or listed as a trade secret, with the option of listing it as a NJRTK disclaimer.

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