I don't know much about the design of German cars, but typically in the Japanese ones, you will find that they are designed to work with loose tolerances, but m

I don't know much about the design of German cars, but typically in the Japanese ones, you will find that they are designed to work with loose tolerances, but manufactured with actual dimensions very close to the "blueprint" and very little manufacturing variation. As a result, you get very robust construction since everything is basically working exactly in the region it's designed for.