Green lid fluid reservior by coolant tank

davenkay

Well-known member
Joined
Sep 23, 2001
Location
Reisterstown, Maryland
TDI
2006 Jetta Pkg. 2
What is the green lid fluid reservoir by the coolant tank and fuel filter? It appears to be filled with oil? the lid has a circle with an oid drop and there are squares in a semi-circle.
 
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