Will using Adblue that's over 18 months old damage the catalytic converter?

Will using Adblue that's over 18 months old damage the catalytic converter or any other of the car's components?

What type of funnel should I use to refill the Adblue liquid?

What type of funnel should I use to refill the Adblue liquid?

How do I know when the AdBlue in my car needs refilling?

I have a Skoda with AdBlue. It has been showing 5500 miles till it needs to be refilled. Currently, the car has covered just over 500 miles, but it's still showing 5500 miles on the AdBlue. Does the counter...