Either I am blind or there is no mention in any of the VW manuals about when or how to change the engine air filter. Yea I don't have really a "how to question" but I thought I could check the service booklet to determine when the dealer should have done this during one of my 3 free oil changes. I know they did not make mention of changing it recently at 33K miles so I am assuming it never has been replaced. Any thoughts from someone who has better eyes than I have??