Toto Wolff discusses Rosberg's new Mercedes deal

2:35Now Playing

Toto Wolff rules out Mercedes engine deal with Red Bull

2:23Now Playing

Toto Wolff - Mercedes 'need to be disciplined'

1:45Now Playing

Toto Wolff says Mercedes ‘love’ Red Bull Formula 1 title fight

6:51Now Playing

TOTO WOLFF: How Mercedes survived an ‘up and down year’ to win 5th straight Constructors' Championship

8:24Now Playing

Toto Wolff reviews Mercedes' season so far