Do I change out my coolant at 100,000 miles?

The best way to check is to take the cap from the radiator off (when it's cool only)...and dip something white in there (q-tip?) then dip another one in some fresh coolant....make a decision based on the difference between the two. I don't think you'll have to do it...it's not so much how many miles you have, but how old the car is. 2009 is still pretty new. Hope this helps