great thread with poll! i have an 06 330i with just under 70k now. still has same coolant from day one. i was actually looking here to find out more about preventative maintenance like a coolant flush. i will be doing it in the next few weeks. i have read before that early models like my 330i last a bit longer but then again the 330i is little different from the 328 and 335. i will be adding this thread to see when others have failed and what costs were. you might wanna add if there were any symptoms before failure and maybe location cause some places have different weather that could affect the cooling system differently.
2006 330i/ Monaco Blue/ ZSP/ ZPP/ I Drive/ Burl Walnut Trim/ Steptronic/ Xenon Adaptives/ Logic7/ CF Mirror Caps/ Matte Black Grills