Ceratec diesel additive to Octavia mk3 2.0 tdi

Hello folks,

I am planning to add ceratec engine additive with the engine oil during my next service.

But, can I use the additive with Octavia 2.0 tdi mk3 which has a wet clutch?

I was confused because Liqui moly website says that the additive is not suitable for wet clutch systems

1) Is the additive only not suitable with dsg gear oil and can be added to engine oil?

2) Is the additive not suitable even to engine oil with wet clutch dsg?

3) Does the engine oil come in contact with wet clutch or gear system?

Please let me know if anyone has experience regarding this. Thanks!