 The McLaren MP4 @-@ 30 was a Formula One racing car designed by Tim Goss and Neil Oatley for McLaren to compete in the 2015 Formula One season . The car was driven by 2005 and 2006 World Drivers ' Champion Fernando Alonso , who returned to McLaren eight years after he last drove for the team and 2009 World Champion Jenson Button . Kevin Magnussen , who drove for the team in 2014 , temporarily stood in for Alonso after a test accident . Additional testing and development work was carried out by Magnussen , Stoffel Vandoorne and Oliver Turvey . The car was the first built by McLaren since the MP4 / 7A — which contested the 1992 season — to be powered by a Honda engine , known as the RA615H , after McLaren ended their twenty @-@ year partnership with Mercedes at the end of the 2014 season . 
