You should do a cooling system overhaul. A 7 year's old cooling system is a time bomb. Buy the parts from FCPEuro and the next overhaul would be essentially free other than labor! Heck, buy your parts from FCPEuro and it would be a moot point what parts to replace  .
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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