Why does my Audi or Volkswagen leak oil everywhere? Most likely there is blockage in the breather hose and/or failure of the engine crankcase breather valve. How does the oil breather vent system work on a Volkswagen? As the oil heats up in the crankcase, vapor is produced and needs to be vented. It travels up that tubing to the Pressure Regulating Valve (crankcase breather valve). Due to emissions regulations this vapor must be routed back to the intake side of the engine to be added to the incoming air and burnt off. This leads to the two most common problems. If there is a blockage, pressure builds up in the crankcase and causes oil to push out and leak from the weakest parts (seals and gaskets) of the engine.
The second part to the leak problem comes from when the car is shut off. The oil is still hot, giving off vapor, which is routed into the intake tube. Now the vapor is just sitting there since the engine is off, the vapor cools, condenses back to a liquid and leaves an oily mess behind.
M13001 2006-2008 Audi A3 Series, 2005-2008 Audi A4 Series, 2008-2009,2010 Audi TT Series, 2007-2009,2010 Volkswagen Eos, 2008-2009 Volkswagen Golf, 2008-2009 Volkswagen GTI, 2005-2009,2010 Volkswagen Jetta, 2008 Volkswagen Passat, 2008-2009 Volkswagen R32,
2008-2009 Volkswagen Rabbit
N16001 2008-2006 Audi A3 Series 2008-2005 Audi A4 Series 2010-2008 Audi TT Series 2010-2007 Volkswagen Eos 2009-2006 Volkswagen Golf 2009-2006 Volkswagen GTI 2006-2005 Volkswagen Jetta 2008-2006 Volkswagen Passat
2008 Volkswagen R32
2006-2009,2010 Volkswagen Jetta
G16001 2005-1999 Audi A4 Series 2004-2003 Audi RS6
2005-1998 Volkswagen Passat