Anybody need to replace one of these at about 100,000 miles? Starts to leak about a half cup every time I shut if off. Looks like a half day job for first timer. Dealer part is about $800. Anybody try one of those "Radiator Classic" jobs on e-bay for under $200? How bad can it be? They have a return policy. If it looks like crap I'll send it back? It doesn't seem that people fix these things like in the old days. Hard to believe the tanks on the side are plastic.