I know cars in Europe have the convex mirrors on both drivers and passenger side vs the US which only has them on the passenger slide. What is the purpose of the vertical line? What does it show you different than the rest of the mirror.
Looking at US forums, it seems there are many head gasket problems on 1998-2000 outbacks. Are these cars all the same or are they different in Europe? In other terms, has many owners in Europe had these sort of problems?