Parts Geek - For 2007-2008 Audi RS4 Expansion Tank Cap API 64778WR 4.2L V8. 2007-2008 Audi RS4 4.2L V8. Notes: Engine Coolant Reservoir Cap -- Standard; 20 lb. WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
