What exactly happens when G11 and G12 are mixed?

Hello,
I have a friend who accidentally put 1 liter of G12 (red) coolant into his expansion tank instead of...
G11 (green-blue) has been refilled .
I'm assuming that there were approximately 2.5 liters of G11 and 3 liters of water remaining.

G11 and G12 are, as is well known, not miscible .
If G11 and G12 are mixed, a brown liquid will be created.
Some people say that the substance tends to clump together or become gelatinous/sludgy.
Some people say it might foam up. The engine's cooling system is then at risk.
Does anyone know exactly what is happening ?

Of course, I advised him to at least change the coolant immediately, and to use G12+ (purple) while he's at it.
to perform (and rinse thoroughly at first, if necessary).
The question we asked ourselves, however, was:
Is that sufficient , if that's correct regarding the clumping?
Perhaps the radiator should be flushed in reverse.
to flush out the blockages

Please provide the text you would like me to translate from German to English.
Other questions have already been discussed in detail.

greetings broesel

Hi,

G11 contains silicone and, in combination with a biocide additive from G12, forms a precipitate that primarily accumulates in the radiator, eventually causing it to become clogged, which reduces cooling performance.
Here's the translation:

Solution: With the engine warm (thermostat open), drain the coolant, refill with as little hard water as possible, using hot water, and drive a few kilometers at a brisk pace. The thermostat must open to flush the radiator. Then, drain everything again and refill completely according to the instructions, using G12+ and hot water. Then, drive again so that the G12+ can reach the radiator and provide its corrosion-inhibiting properties. Then you can safely put your car in the garage for about half a year if you tend to ride a motorcycle in the summer.
Coolants G11 and G12 are environmentally hazardous and must not be disposed of through the sewage system.

Regards,
Micha

G11 contains silicone...

Do you mean containing silicon?
I'm hearing about silicone in that context for the first time.

Hi broesel,

Hi,

Quote:

I'm hearing about silicone

for the first time in this context.
Yes, I'm hearing that for the first time in this context as well. I wonder where my thoughts were just now...
Of course, it's about the silicates in the G11. (But that doesn't change the fact that the mixture needs to be removed from your friend's place urgently.)

P.S.: I don't know exactly what's in G12+. I only know that some manufacturers specify silicate-containing antifreeze for certain engines. BASF (the manufacturer of the product) says that G12+ is "compatible" with G12 and G11. I don't know if that means you can replace the G11 (silicate-containing) coolant with G12+ in every engine. (I suspect you can, but I'm not sure!) So, be sure to check the service manual for the approved coolant type.

Regards,
Sure, here is the translation of the text from German to English:

"Micha"

Hello Micha,
It's interesting that you're bringing up this topic.
I recently had to replace the head gasket on my G3 1Z (manufactured in 11/95) due to significant water loss and compression in the coolant.
and replaced the timing chain, which required changing the coolant (mainly because of the exhaust gases that can get into the water).
Inside was G11 (which is green-blue). Eventually (after reading some forum posts), I...
I decided to use G12+ (which, as you know, is purple). In the store, they had BASF G30 and Alu Premium Protect (purple).
(1L, 4.9 Euros).
According to BASF, it is compatible with all Glysantin products and therefore meets the G12+ specification.
Since it was the only purple antifreeze available, I decided to buy it on the spur of the moment, even though it's a specific type.
Recommendation for modern aluminum engines (but also suitable for all common engines!).
To the best of my knowledge, in the 1Z model, the cylinder head is still made of gray cast iron, while the cylinder foot is made of a lightweight metal (likely aluminum).
I wasn't entirely sure anymore, but I ultimately decided not to return the G30.
It would almost be disrespectful to call the 1Z engine an uncommon or unpopular engine.

Finally, I thought to myself, if VW completely switches to G12+ (as can be read in the forum),...
It probably has to be compatible with all engines, even though it is silicone-free.
because workshops are not only required to replace the entire coolant fluid when changing the ZKD (cylinder head gasket).
So, they can only use G12+ lubricants now, regardless of whether the manufacturer specifies a requirement for silicate content.
or not.
Now the G30 is finally installed!

I would also be cautious about relying on the service record, because back then (November 1995), there was...
'Geniale' is not yet fully compatible with the G12+.
RoBro wrote the following in a relevant forum post:
Quote:
...I did some research, and it turns out that the silicates are actually responsible for the corrosion protection.
It appears to be mainly for gray cast iron, and with aluminum, they seem to cause pitting...


Perhaps the ingenious G12+ achieves corrosion protection for gray cast iron through a silicate-free additive .

Or what do you think ?

Sure, here is the translation of the text from German to English:

'Another question:'
I have a measuring device from ATU (model FL1800, 7.9 euros) that is supposedly for G11 (according to the ATU employee, it is not suitable for G12!).
Does that not apply to G12+ either http://www.basf.de/basf/html/d/produkte/gebiete/glysanti/produkte/g30.htm?
I once measured: -34 to -35°C!
It actually corresponds quite closely to the calculated/interpolated value: 34.5°C.
(3L BASF G30, total water volume according to the repair manual is 6.5L, so approximately 3.5L of water is needed, and BASF specifies 3L).
(Mixing ratios with temperatures specified; I then interpolated the value.)

Hi broesel,