That's what the MY2004 service booklet says, and it applies to C, S, SLK, CLK, SL, and CL. Am I reading it wrong!?
I recall reading threads after threads in this forum to change coolant every 3 years. Why the newer models have jumped to such looooooooooong interval?
BTW, the same booklet does say change brake fluid every 2 years, which is same as advice in this forum.