Name of movie with two hitchhikers picked up by middle-aged guy in convertible?

[jmc2000]

Hi everyone

I'm looking for the name of a foreign movie from the early 80s at least that starts with two young women, a blonde and a brunette, in their early 20s drinking and fooling around in the countryside who get picked up by a guy in his 40-50s driving an open top convertible.

After a minute, the blonde woman whispers something into his ear and he screeches the car to a halt. The camera then switches to the surrounding scenery from high above, and slowly zooms onto the car where the guy is now fucking the blonde in the drivers seat, with the brunette in the back swigging from the bottle. She then hits him over the head with it, killing him, and they steal his car.

It used to be on Youtube, was over an hour long, and was possibly Italian or Argentinian.

Thanks in advance

Jack