Williams has signed a new multi-year partnership agreement with Brazilian multi-national energy company Petrobras. The two companies worked together for 11 years, beginning in the 1990s, but had to go their separate ways because of the demands of engine suppliers. This new agreement will see the Williams and Petrobras technical collaboration continue once more as the two parties work together to develop a new specialist motorsport fuel for use by the team starting in the 2015 season. With new engine regulations coming into effect from 2014 that require teams to use more efficient fuels, Petrobras’ expertise will help the team get greater energy efficiency. Petrobras will use the global platform of Formula One to further brand awareness through the placement of its logo on the side of the Williams Mercedes FW36 chassis and across the team environment and apparel.