Buy 2018 Audi S5 Sportback Engine Coolant Reservoir Cap. 2.5 LITER, AUXILIARY. 4.2 LITER, RETURN. 4.2 LITER, RETURN, VIN - OEM Audi Part # 8J0121324 (8J0-121-324)

Engine Coolant Reservoir Cap. Plug.
A cover that prevents foreign debris from entering the container. Included with: Lower hose.

Engine Coolant Reservoir Cap

Fits A8, S4, TT, TT RS, TTS

2.5 LITER, AUXILIARY. 4.2 LITER, RETURN. 4.2 LITER, RETURN, A4/S4. 6.0 LITER, RETURN, FROM VIN 4E6011643. 6.0 LITER, RETURN, TO VIN 4E6011642.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2018 Audi S5 Sportback to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.