This radiator coolant reservoir/expansion tank for E46 M3 is a common failure item as the plastic weakens and cracks, causing coolant leaks. If your E46 M3 has over 80k miles and still has the original expansion tank, we highly recommend replacing it during your next major service.
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The URO Parts 020655 Crankshaft Position Sensor offers a cost-effective alternative to expensive OE components without sacrificing quality or longevity.
