 Complete the following phrase:  In the 1960s, the Formula One German Grand Prix was often held concurrently with a Formula Two race on the same circuit, allowing BMW F2 cars to take part. In 1967, BMW entered Hubert Hahne in a Lola F2 chassis powered by an enlarged BMW engine which meant that it conformed with the Formula One regulations, while David Hobbs was entered by Lola in the same combination with the standard smaller BMW engine. For the 1968 race, Hahne returned with the previous years combination and finished tenth, BMWs best result up to this point in its Formula One history. BMW then entered three of its own 269 F2 chassis for the 