For Audi A6/S6/Avant/Quattro 4F 2009 - 2011. 2.0TDI Oil pump balance shaft / Hex Drive Key 77mm With Ring. The good news?. A key warning sign to watch for: If your red oil warning light flickers at engine speeds between 1,600–1,800 RPM, it’s likely a cry for help from this worn hexagon.
