Ive always had a problem with Volkswagon because it was a SPECIFIC creation of the 3rd Reich. The name itself is a Nazi name... As the nazis used VOLK in the names of nearly everything they created.
However, in practice, I really only boycott German companies that knowlingly helped or abetted the 'final solution'. Ive heard BMW might be guilty of this, and they used concentration camps for free labor.
But there are thousands of German companies that were around in the 1930s and 40s and I use their products all the time. To me its much more important to boycott countries that are doing things NOW in the present, since boycotting them actually serves a purpose. But boycotting Bayer, Kodak, Hugo Boss, Mercedes serves no purpose. People need to be held accountable for what they did, but the current owners and administrators of these companies have done nothing, and werent even alive when the atrocities happened, many arent even German. Unless buying the products somehow glorifies Naziism, (Again, I think Volkswagon sorta does) I'm not gonna boycott it.