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Engine analysis - Mercedes FO 108S 20 November 2006

This engine displayed some worrying reliability problems right from the very start of last winter's early testing sessions. In fact, for much of January McLaren were obliged to run the MP4-21 in a hybrid configuration, using a modified version of the older V10. By the first race in Bahrain, the inner weaknesses of the V8 had seemingly been solved, but over the course of the season this proved not to be the case. As with the Toyota, the McLaren's problems weren't only engine related, but the need for several pre-race engine changes combined with a string of retirements helped prevent the team scoring a victory in 2006.