Shop OEM Volkswagen Group Part # 4H0121403M (4H0-121-403-M, 4H0121403G). Engine Coolant Reservoir. 4.2 LITER. 6.3 LITER, PRIMARY. A8. DIESEL. GAS, PRIMARY, 2013-14. GAS, PRIMARY, 2015-18. Engine Coolant

Engine Coolant Reservoir. Expansion tank.
A container that holds Engine Coolant.

Engine Coolant Reservoir

Fits A8

4.2 LITER. 6.3 LITER, PRIMARY. A8. DIESEL. GAS, PRIMARY, 2013-14. GAS, PRIMARY, 2015-18.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.