Almost everything is new I think the expansion tank is I have no idea to tell you the truth . I bought at Napa . I know big mistake I could have bought the genuine bmwLeaks from tstat and water pump vs a bad headgasket merit a thumbs up in my book. Very easy to replace those.
How much of the cooling system has been changed so far? And what brand was the expansion tank you put in?
I just need to change the water pump and thermostat and Lower radiator everything else is new most is genuine bmw . Expect radiator and the lower hose and thermostat and water pump
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