That looks like a 6cyl to me. It also says so on the ad "2.5 turbo".
in order to avoid the glut of high mileage European luxury cars that will undoubtedly be picked (hi BMW E39 540i) I offer:
2002 M5
all wheel drive, all wheel steering, active aero front and rear... this is the ultimate 90's mobile!
Well thats because they never did, however it doesn't look half bad.