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BMW cooling systems have always been an issue peaking with the E46. The expansion tank was next to the hot side on the radiator. Top it off with a trans cooler then you get expansion tank exploding after 60k miles. The plastic doesn’t hold up.
Not so much of an issue for the M cars since the tanks are away from other gear sources. The only benefit I can think of is the aluminum is an extra heat sink so you might get some added cooling.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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