Merc uses their remaining engine development tokens with an eye on 2016 evaluation. Note, that evidently this is the first time that the development is not available to customer teams.
http://www.autosport.com/news/report.php/id/120601
http://www.autosport.com/news/report.php/id/120601
Mercedes has used all seven of its remaining engine development tokens ahead of the Formula 1 Italian Grand Prix with an eye on 2016.
It means drivers Lewis Hamilton and Nico Rosberg will each utilise their third power unit of the season in the W06 ahead of first practice at Monza.
The move represents a tactical change by Mercedes, with the development only available to the works team for now and not customers Williams, Force India and Lotus, as it effectively pulls forward 2016 development.