Williams on Tuesday finally confirmed long speculation the Brazilian oil company Petrobras will return as a sponsor in 2014.
The team announced the deal on Tuesday.
A media statement said Williams' Mercedes-powered FW36 will feature Petrobras logos, while a new fuel will be developed for use in F1 in 2015.
"Technologically they are very strong and that will be important for the team as the new regulations have made fuel efficiency increasingly important," team founder and boss Williams added.
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