I thought the manual said every two years? But then, I have a 2007.
I replace mine every year, immediately following the pollen season. But I think I drive my car more in three months than you have all together.
I buy my parts from
Suncoast. I replace my filter with the
charcoal filter, because that's what the car came with. The
paper filer will save you $32 a year. For me, I find it hard to believe that anyone who could afford a Cayman needs to find a $32 a year savings opportunity. The charcoal filter handles oders as well as pollen. I don't think the risk of my leather absorbing a splattered skunk is worth $32 a year to me.