Most likely that the oil cooler has failed or is failing.
Having mine fixed now, 03 passat.
Someone is putting it there. There is no way for oil to get from the engine to your fuel tank by natural means. Literally, if you have oil in your fuel tank, someone is sabotaging your vehicle by putting the oil there.
The thermal Fluid expansion tank is used to heat naphthenic fluid which is FDA approved to heat the vegetable oil that they use to cook their kettle chips amoungst other snack foods.
metal pan is the oil pan on 2003 Volkswagen Passat.
how to remove oil pump for 99 vw passat.
what oil do I use for a 59 reg vw Passat 2.0 tdi
Location of oil pressure switch 2003 VW passat
Check your intake manifold gasket
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The 2001 Passat wagon uses 5.7 pints of oil to 6.5 oil. Do not overfill as that may cause overflow to damage the catalytic converter.
Oil in the expansion tank indicates a leak between the internal oil channels and water channels within the cylinder head. This is usually attributed to a failed cylinder head gasket, cracked cylinder head or cracked oil cooler (where fitted).
Getting rid of an old oil tank is a difficult task. The oil will have to removed first. You may be able to donate the oil. The tank must them be cut in half in order to get it out of the house. Call your local trash collection company to find out where you can take the tank for disposal.
The recommended oil for a 2003 Volkswagen Passat with a 2.8L engine is 5w30. This is well suited for most driving conditions.