Mercedes has demanded clarification from Formula 1 authorities on rules restricting aerodynamic testing and preventing collusion between rival teams.
Sebastian Vettel finished 2015 with an eye-catching drive from 15th on the grid to finish fourth in Sunday's Abu Dhabi GP and then forecast that Ferrari can overcome 'beatable' Mercedes in 2016.
Nico Rosberg ended his 2015 season in triumph on Sunday when he completed a hat-trick of victories in the Abu Dhabi Grand Prix ahead of Mercedes team mate and world champion Lewis Hamilton.
2016 could be Nico Rosberg's final season in silver, former F1 driver Mika Salo has predicted.
Fernando Alonso was left baffled Saturday by McLaren team chief Ron Dennis's cryptic suggestion that the two-times world champion may be taking a sabbatical in 2016.
Nico Rosberg ended his 2015 season in triumph when he completed a hat-trick of victories at the 2015 Abu Dhabi Grand Prix.
Niki Lauda is on the brink of quitting Mercedes, reportedly over a dispute with fellow team chief Toto Wolff about Red Bull.