McLaren Mercedes have notified the FIA of their intention to appeal the race stewards' decision not to penalise BMW Sauber and Williams.
The Brazilian Grand Prix stewards have confirmed the race results, deciding not to take action against BMW Sauber and Williams despite a report from the FIA technical delegate that stated temperatures of fuel samples taken from both cars of each team were outside the regulations.
McLaren's decision to appeal leaves the results of the drivers' world championship in a state of uncertainty.
If the FIA's International Court of Appeal overturns the stewards' decision and, more crucially, disqualifies the Williams and BMW Sauber drivers, then McLaren's Lewis Hamilton will be elevated to fourth - giving him enough points to beat Kimi Raikkonen to the world championship title.
The ICA would still need to accept McLaren's appeal, though, and in that case a date will be set for the hearing.