The SA said it's 6/100k, and since my car is a month shy of 6, it's up to me if I want to do it. Last year, the dumb SA who told me my car uses special oil, said my coolant is "lifetime." He said you never replace it. Didn't even want to do it!
Best part is I saw the tech wheel the machine that exchanges the coolant up to my car, so they really did the work.