Recently changed out wife's X3(N52), original BMW radiator, cooling hoses, and 1 gal aftermarket coolant. In total it's about $650.

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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles