BMW 635d (2007) CAR review

A 635d? Hmm, potentially an interesting combo…

Indeed. Mating the excellent twin-turbo 3.0-litre diesel to BMW’s mildly-facelifted 6-Series Coupe and Cabriolet, creating (they say) the world’s first diesel GT 2+2, is something we’ve been anticipating with intrigue. The 282bhp unit has the same power as an ‘80s M 635 CSi, yet the 427lb ft of torque is over 10 percent up on the current M6. Oh, and it’s delivered between 1750 rather than 6100rpm. And 95 percent is yours at 1500rpm, too. As such, BMW promises near-instantaneous throttle response from the sequential turbo set-up, aided by a quick-fire auto (no semi-auto nonsense here). It’s also the world’s first 40.9mpg luxo-sports car.

You’ve sold me on the figures but, as a petrolhead, I’m still to be convinced…

Try this. Cruise at 60mph, then tweak the throttle. Just a tweak, that’s all. Feel that? Instant response, linear as you like, with shove like no other 6 in normal use. With 62mph taking 6.3 seconds, this is a fast car – but all that torque means it’s real-world fast. It makes a mockery of all the flurried downchanges you need in an M6, and yet the other failing fast diesels can suffer – runaway, uncontrollable surge – is also metered. It’s like a very powerful petrol turbo (with similar response), and pretty additive to boot. Other than at tickover and near 4,000rpm, it doesn’t even sound dieselly: the straight-six vocals are throbby, bassy and very smooth.