Hey all!

Quick question, are E90 cooling systems similar to an E46? Specifically in the aspect that they are changed entirely every 80k miles or so?

A friend of mine has an auto E90 328i with 69k SoCal miles on it. The coolant light has come on several times a week as of late, and they are adding distilled water. I took a quick look last night in the movie theater parking lot and it appears that the radiator is leaking at the bottom. I'll be doing the work for them, so should we go ahead and order all of the cooling system components?