Induction system Cleaning

[H2 BULLY]

When and how often should you have your induction system cleaned. I am at 16000 miles and my dealership is already telling me to do it, but I find nothing of the sort in the owners manual. I just want o make sure I am not doing it too soon or if it needs to be done at all with all the additives in fuel these days to help keep your engine clean.