It might be built overseas.. I know that DSMs had their engines built in Japan and the rest of the car was assembled in the US. That might be the case here as well. Were the Mexico-based VW Jetta engines being assembled in Mexico, or were the engines just shipped over and dropped into the car at the plant? I'm guessing the latter. I would think engine assembly is something you'd want done in one place - the source. If the Zetec engines were designed/engineered in Japan, then there's a good chance they're shipped from Japan.