With the question 'how good is the BMW 6 Series' is linked the question 'just how versatile is the modern car platform?'.

Because, beneath the unconventionally-styled skin of BMW's big coupe and cabriolet (and four-door Gran Coupe), lies the same architecture you'll find beneath all of BMW's large rear-wheel-drive cars, including the latest 5 Series, the 5 Series GT, 7 Series saloon and even the £200k Rolls-Royce Ghost.

Can you really take a platform used for a full-size limo and adapt it to make a convincing GT? We'll see.

What's already clear is that, as is now the norm in the BMW range these days, the badging gives no clue to the engines under the 6-series' long, sculpted bonnet. The 640i features a 316bhp 3.0-litre, six-cylinder turbo, while the 650i gets a 402bhp 4.4-litre twin-turbo V8. There’s also a 309bhp twin-turbo 3.0-litre diesel, badged 640d.

The same engines feature in all variants of the 6 Series, including the Mercedes-Benz CLS-rivalling 6 Series Gran Coupe, even when the range was facelifted in 2015.

Top 5 Grand tourers

  • Mercedes-Benz SL

    Mercedes-Benz SL

    1
  • Mercedes-Benz CLS
    Does the Mercedes CLS lead the four-door coupé pack?

    Mercedes-Benz CLS

    2
  • Porsche Panamera
    The Porsche Panamera was first launched in 2009 and revamped in 2013

    Porsche Panamera

    3
  • Audi A7
    The Audi A7 Sportback delivers on all fronts, except for an ability implied in its name

    Audi A7

    4
  • BMW 6 Series coupé
    The 6 Series shares its plaform with models as diverse as the 5 Series and Rolls-Royce Ghost

    BMW 6 Series

    5

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