My original radiator was going strong at 20 ¹/₂ years and 205,000 miles (330k km). I wouldn't preemptively replace one with no issues either. (though my new to me e70 is fairly flattened (fins) and that's a lot of manual labor to straighten out I may replace it).

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)