Once a year, self-made German billionaire Jürgen Grossmann invites car aficionados and friends to his “Classic Cars & Cuisine Culinaire.” The non-competitive road rally combines vintage cars and good food. The endpoint of the excursion is usually Mr. Grossmann’s three-star restaurant in the northwestern German city of Osnabrück. His steel-manufacturing company, Georgsmarienhütte, is nearby.
Mr. Grossmann, 63, also invites business partners. In 2008, 80 cars traveled from Bremen to Osnabrück. Russian oligarch Leonid Lebedev, 58, was among the participants.
At the time, Mr. Grossmann was chief executive of RWE, Germany’s largest utility company. It was working with Mr. Lebedev’s Sintez Group, one of Russia’s biggest privately owned firms, on the acquisition of a Russian electricity producer.