Genuine BMW 17-13-2-284-600 Coolant Expansion Tank - for M2 M3 M4

The Genuine BMW 17-13-2-284-600 Coolant Expansion Tank is an OEM replacement reservoir designed specifically for BMW M-Series vehicles equipped with the S55 engine. This factory expansion tank maintains proper cooling system pressure and capacity, serving as the highest point in the cooling system to capture air and allow coolant expansion as temperatures fluctuate.

Key Features:

• Genuine BMW OEM part manufactured to factory specifications
• Allows excess pressure and fluid to safely bleed off from the cooling system
• Positioned at the highest point to purge trapped air from the system
• Maintains optimal coolant levels as fluid expands and contracts with temperature changes
• Direct replacement for damaged or leaking expansion tanks
• Engineered specifically for S55-powered M vehicles

The expansion tank plays a critical role in preventing engine overheating by maintaining proper cooling system pressure and preventing air infiltration. Signs of a failing expansion tank include coolant leaks, visible steam from the engine bay, or difficulty maintaining proper coolant levels. This genuine BMW replacement ensures reliable performance and proper fitment for your M-Series vehicle.

Also Known As: Coolant Reservoir, Overflow Tank, Coolant Recovery Tank