My 2012 IS 250c immediately began to smell like mold from the ventilation system, and the dealer said that this is due to Lexus' decision to almost all the time have the car in re-circulate mode. EVEN with the top down, which seems crazy to me. No way to change it that I am aware of, except manually every time you start the car. The Owner's manual does not discuss the reason for this. Any additional info appreciated.