Sure, cf the image in comments, it is that one. Good find

Maybe the Merc is from 'The Damned United': http://www.imcdb.org/vehicle_278844-Mercedes-Benz-250-CE-W114-1969.html ?

Ingo, if it's a Mercedes W 114 it could be this movie http://www.imcdb.org/vehicle_186678-Mercedes-Benz-C-W114-1974.html

Yet no Opel Rekord with Taxi sign and Berlin plate on this website =(

Yes, no.4 is an Opel Rekord D in West German taxi colour, the plate seems to be from West Berlin.

No.3 is a Mercedes W 114 Coupe, 280 SE maybe.

#6 looks seems to be a Ford Crown Victoria of 1998 or later (the most common car on the site )

#3 close-up. seems to be a European movie/car. my closest guess is a mercedes.

Btw, here's an alternative shot for #6
http://www.mediafire.com/imgbnc.php/43200342adba6e08c53eabf7d899f173040729d25eb4- 7209a01b1cda980918316g.jpg

atom, thanks for #1.
#4 I think you are spot-on with the 1972 Opel Rekord. However my search on this site yielded nothing. The distinctice door painting (looks like a fruit to me) and the taxi sign would make it stick out like sore thumb. Possibly not included yet.

#1 is from the movie Crash: http://www.imcdb.org/vehicle_78445-Dodge-Stratus-1995.html

Isn't #4 just an ordinary Opel D Rekord? Like this: http://www.imcdb.org/vehicle_71356-Opel-Rekord-1972.html ?