I found ample information on how exactly to top up the PAT fluid tank but I stumbled upon quite a few difficulties exploring the diagbox software. I still haven't done anything, I am trying to find out four things:
1. How much fluid do I need
2. What fluid do I need
3. How to reset the counter
4. Should I change the amount of additive pumped into the PAT?
First of all, as far as I could find out, different models have different controllers and different procedures. Turns out I have some options in the motor ECU and some other in the Diesel Additive Pump ECU.
As far as the first question is concerned, on the one hand, the standard parameter measurements in the Diesel Additive Pump ECU tell me that the total capacity of the tank is 1,4 l and I have around 200ml left. So I guess I need to get 1,2l in, right?

Well, I am not so sure, because on the other hand, the ECU Standard parameter measurements are showing something different. 156 ml fluid left and 1160 ml total capacity.. So in that case I need to top up 1l of fluid.
Which one is true? Here is screenshot of all the live data.

Second question: What fluid do I need? It turns out there are supposed to be 4 types in different colors (green, blue, etc.)... But how do I find out which is the right one? Or can I use something like this (s. picture below)? it is supposed to work for all types....

Third, how do I reset the counter? I found something which sounded promising unter "repair" in both the engine management ECU and the additive pump ECU. Should I reset both? Will the counter then get reset?
There is one fourth question: According to the engine ECU, I am getting 45g of fluid pumped into the PAT.

However, the diesel additive pump ECU is showing a table which indicates that my car, having about 210k km, needs 138g of additive... Apologies for the bad quality of the screenshot, but here it is:

However, I have a hard time imagining that I have to reprogram the value every 10k km... What am I missing?
Apologies for the long post. I really didn't want to get overly scientific about this, I'm just trying to figure it out...
Thank you so much...