Where is the crankshaft ventilation valve located on an Audi A6?

[DelJulianna]

The crankshaft ventilation valve on an Audi A6 is installed beneath the intake pipe and can only be seen after removing the intake pipe. Function of the crankshaft ventilation valve: To prevent excessive pressure in the crankcase, extend the service life of the engine oil, reduce wear and corrosion of components, and prevent engine oil leakage, crankcase ventilation must be implemented. Additionally, to meet increasingly stringent emission requirements and improve fuel economy, the design of the crankcase ventilation system is also essential during the engine design process. Categories of crankcase ventilation: Crankcase ventilation includes natural ventilation and forced ventilation. Modern gasoline engines commonly use a forced crankcase ventilation system, also known as the PCV system.