If you're asking in terms of highest level of luxury, attention to detail, horsepower, and performance, then the best BMW series is definitely their luxury class 7 Series. It is the automaker's flagship car and has the Audi A8 and the Mercedes-Benz S-Class as its main rivals. It is only available in sedan form, but comes in long-wheelbase and short-wheelbase models.
There are several engines and trim levels that one can choose for each car. The current range of gasoline and diesel engines for the car consists of: 6.0L 552 PS (406 kW) twin turbo V12 4.4L 407 PS (299 kW) twin turbo V8 3.0L 326 PS (240 kW) I6 3.0L 245 PS (180 kW) turbodiesel I6 3.0L 306 PS (225 kW) turbodiesel I6 The buyer also has the choice between an 8-speed and a 6-speed automatic transmission.
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