I just picked up a 2014 A4 S Line. The stealership tried to sucker me into buying this eletronic rust module, which I assume drains the battery even faster. On a car with a 12 year rust warranty should I even bother? Sales jockey said yeah but this will protect your rocker arms from salt.
??????
Won't rinsing the bottom of the car a few times at a coin wash do the same???