I think we need another car...

[robg]

Originally Posted by Terri Kennedy

Bizarre. I've always heard the BMW cooling system mantra as "replace everything between the engine block casting and the front bumper".

I had thought so too... but a quick search reveals that cooling system overhaul kits (sold by a wide variety of vendors) don't seem to include radiators... so that could be why the PO didn't do it. Here's 1 example:
https://www.turnermotorsport.com/p-5...x-25l-28l-30l/