Should I use a diesel additive?

Which or what type of additives should I use with lesser brand diesel fuels and how frequently?

Should we use a diesel additive?

I bought VW Tiguan 2.0 TDI 2015 but we do not do a lot of miles as we used to. We hardly do 2000 miles a year and mainly short journeys. We are aware of the carbon deposit which damage the engine but we...