Autotrivia Quiz

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Last week I asked, what car is this? 375,000 built over 17 years. Four cylinder with a top speed of 42 mph. It was the Austin 7.

So to this week. Porsche, Mercedes and Auto Union race cars, as well as being German have something else in common, which other race cars do not have. What is it?

For the Automania free beer this week, be the first correct answer to email [email protected]  or [email protected] . Good luck!