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The Moroso coolant tank for 1988–1991 BMW M3 (E30) is a replacement expansion reservoir specified for those models. It serves as the system overflow and coolant collection point, intended for use when repairing or restoring the factory cooling circuit. Verify fitment against your E30 M3 plumbing and mounting before installation to ensure proper connection and routing.
Moroso 88-91 BMW M3 E30 Coolant Tank
