I've owned a 2002 W8 passat sedan since 2007. I had to import a rebuilt engine from Germany in 2008, and had both catalytic converters replaced in 2012. My son put a hole in the oil pan and immediately parked it. I had it towed from the scene. That was in October. Mechanic tells me it isn't worth anything anymore because I let it sit so long in bad weather. Good advice?