Yesterday,I took the xB to the dealer for a free scheduled oil change. Along with it, they filled a check list containing all the things that were looked at. There are three columns. Green for O.K.,yellow for maybe,red for needs attention. The only thing checked red was the cabin air filter. How does the dealer check this filter?The manual says that the filter needs to be replaced ~30k miles.My '09 xB has 7400 miles on it. Maybe they are just trying to make extra $ you think?