 With Spain being the first race in Western Europe , and a mid @-@ season test coming up after the race , many teams introduced their first major car updates for the Grand Prix . Mercedes ran a new front wing with a " more <unk> " nose during first free practice . Other changes were made to the engine cover and the rear wing . McLaren made more significant changes to their <unk> @-@ 31 , most notably on the front wing , which Sky Sports commentator Ted <unk> called the " most intricate front wing I 've ever seen " . Force India updated their <unk> to improve <unk> . According to the team , they were looking for improved <unk> rather than faster lap times . Renault introduced a new chassis for Jolyon Palmer . More significantly , the French manufacturer debuted a new version of their power unit for both their works team and Red Bull at the two @-@ day test following the race . All other teams except for Sauber also made changes to their cars , with the Swiss team continuing their financial struggles . They also announced that they would be forced to miss the mid @-@ season test , being unable to field a development driver , with regulations demanding that two out of four test days be driven by young driver talents . Both Sauber and Haas were allowed to use the updated version of Ferrari 's 2016 power unit , which the works team had already used in Russia two weeks earlier . 
