A high mileage 2001 Audi A4 Quattro 2.8 for my son Car is a manual with almost 200K miles, seems to be well maintained but am getting nervous based on feedbacks about 1.8. A high mileage 2001 Audi A4 Quattro 2.8 for my son. As Red Baron pointed out the problem is really a pcv valve problem causing the cam gaskets to leak. I had this car repaired twice only to have it leak in about 3-4 2001 AUDI A4 1 L4 Turbocharged PCV (Positive Crankcase Emission Repair Manual. Engine Repair Manual. Headlamp Bulb. PCV (Positive Crankcase Ventilation) Hose. Valve Keeper Tool AUDI 2001 A4 1 L4 Turbocharged Exhaust & Emission PCV (Positive Crankcase Ventilation) Valve. Price: Alternate: No parts for vehicles in selected markets. Economy .