Table:
text: 1979 Formula One season
Drivers and constructors
Drivers and constructors
Constructor_ Chassis Engine Tyres Driver Rounds
Alfa Romeo 177 179 Alfa Romeo 115-12 3.0 F12 Alfa Romeo 1260 3.0 V12 G Bruno Giacomelli 6, 8, 13, 15
Alfa Romeo 177 179 Alfa Romeo 115-12 3.0 F12 Alfa Romeo 1260 3.0 V12 G Vittorio Brambilla 13-15
Kauhsen - Ford WK Ford Cosworth DFV 3.0 V8 G Gianfranco Brancatelli 5-6

Question: What engine was used in the 1979 Formula One season by rounds 5-6 of the 1979 Drivers and Constructors?