Hi,

I have just unplugged to check if my Skoda Fabia 2018 1.0 TSI expansion tanks contain silica so as to replace it with silica free and completely change the anticoolant from G13 to G12evo.

The OEM number is 6Q0121407B.

Attached are the photos. I have asked three AI engines but all say is silica free.

I just wanted a second opinion so as to proceed with only anti-coolant change to G12evo.

PS. the level of coolant is low because I sucked out a bit in order to be easier to unplug to check the OEM.

Welcome to the forum.

Usually the OEM EV is marked 'Mit Silicat' if they were fitted with the Silicate bag (or later) plastic dispenser.

It's possible that EV is not original.

If the bag is present, it can usually be seen if a light is shined through the EV wall, especially the double-walled type - the plastic dispenser should be visible by removing the cap and looking at the bottom - I'm not aware of any issues relating to the plastic dispenser type though.

To be certain, why not just replace the EV for a new one when you change the coolant to G12evo?

Edited 46 minutes ago46 min by Warrior193
added information

Thank you for the reply! It is actually the original tank since I bought the car brand new in 2018. There is no tag "Mit Silicat".

Now my Skoda is in 70 000km so was checking to pump out all the G13 from system (had done it when car was 4 year and 35000km).

And in the search I found out that G12evo is replacing G13 but to replace the expansion tank in case is silica double-walled type.

It does not have any silica bag inside, that I have been inspecting carefully.

AI engines says that 6Q0 121 407 / A / B was already used on earlier Fabias, long before the later 5Q0... silicate-reservoir issue,

Since there is no problem with the tank I was thinking to keep it if is silica and replace later on a damage or leak.

Edited 10 minutes ago10 min by AlexNk