Buy 2003 Audi A8 Engine Coolant Reservoir Cap Seal. 3.7 LITER. 4.2 LITER, 1997-99. 4.2 LITER, 2000-03 - OEM Audi Part # 171121327 (171-121-327)

Engine Coolant Reservoir Cap Seal. Washer.
A circular disk covered in rubber or plastic with a hole in the center where the edge is sometimes tensioned by a spring that prevents fluid from leaking at the Engine Coolant Expansion Tank Cap. Included with: Cap assembly, Reservoir Cap.

Engine Coolant Reservoir Cap Seal

Fits A4, A8, S8

3.7 LITER. 4.2 LITER, 1997-99. 4.2 LITER, 2000-03. 6 CYLINDER, 2.8 LITER.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2003 Audi A8 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.