I recently went to the dealer to purchase and have installed a new battery. It was recommended to have an intake induction service. It should be done at 30k. I'm at 50k. I called around to other shops that specialize in foreign vehicles. I was told the service is just a mark up. I don't really need it on a 2008 528xi. What do you think? Should I go ahead and service my car or can I wait a little longer?