As a person who is very interested in cars and somewhat of human dictionary of cars it was a tad sad to see such grave faults in one movie. The BMW is one of two factorybuilt 750 with a manual 6-speed gearbox. It has a V12.
The other major mistake is that all the black Mercedes are S600, there aren't really a choice for the "gangster" to choose anything else.

About the source, the special contents of the DVD provide that information.