This two-door 4 Series has all the predictable BMW coupe design elements we've seen so often over the years - the short overhangs, the long bonnet, the set-back passenger compartment, the shallow frameless side windows leading into the signature Hofmeister kink on each C-pillar and a flowing roofline that offers up a low, stretched silhouette. It's a true sportscar profile that's here been. re-interpreted a little.
You won't really appreciate just how much unless you happen to be super-familiar with the original pre-2017 version of this car, but just in case you are, we'll cover off the changes, most of which are found at the front. The unbroken central air intake is the main visual update, featuring an aperture that increases in size towards the outer edges, lending, BMW hoped, a more imposing presence to the nose section.
Inside, as with obvious rivals, you're treated to one of those 'belt butlers', an electrically-extending arm that (rather slowly) hands you your belt buckle once you get in. The driving position's lower-set than it would be in the kind of more ordinary 3 Series model that shares most of its engineering with this car. And you get a re-designed leather-wrapped sports steering wheel that feels great to hold.
The level of infotainment on offer was upgraded in this facelifted model, though still not to the point where the high-mounted centre-dash screen could be touch-sensitive. Standard models come with a 6.5-inch monitor, but most original owners upgraded to the larger 8.8-inch display that's standard with the more capable 'BMW Professional' media package.
Getting into the back isn't the easiest task in the world and once you're snuggled in there, you'll find a slightly strange combination of decent legroom but rather pinched headroom. The extra 50mm of wheelbase this car enjoys over its 3 Series Coupe predecessor really tells here, freeing up 13mm more stretching room for your lower limbs. Unfortunately, the lowering of the roofline by 16mm that was necessary to achieve those slinky looks will see taller folk grazing their scalps on the headlining. Still, assuming they're not sat behind a couple of basketball players, most adults will be fine in the back on all but the longest trips.
There'll be reasonable room for their luggage too. Once open, the boot reveals a large but shallow 445-litre space that probably does quite well to get within a whisker of the cargo capacity of slightly frumpier-looking rivals. BMW insisted on charging extra for a split-folding rear bench from new, but most original buyers specified that.
Most of the 4 Series Coupe buyers in our ownership survey were very happy with their cars but inevitably, there were a few that had issues. One owner had to replace a catalytic converter, an exhaust pipe and an auxiliary radiator, while on another, the air tube on the turbo broke. Elsewhere in our survey, there were problems with water pump thermostats and rear indicator bulbs. On one car, the front camera tended to fail in high climate temperatures or when sunlight directly shone on it. Niggly problems included a failure of the trunk release, the remote entry system and the front passenger's electric seat. There are also issues with the surfaces of the alloy wheels pitting: check the rims carefully on the car you're looking at.
(approx prices based on a 2017 420d ex VAT) An air filter costs in the £8 to £11 bracket. An oil filter costs around £8. Front brake pads sit in the £40 to £80 bracket for a set, though you could pay up to around £100 for pricier brands. Front brake discs sit in the £105 to £122 bracket, though for pricier brands, you could pay much more. Rear discs can cost up to around £356. Wiper blades cost around £12-£14. A rear lamp is priced at around £145-£163. A front bi-xenon headlamp costs in the £546 bracket.
On The Road
This 4 Series Coupe built on a familiar basic winning Bavarian formula. Rivals have tried to copy the front engine, rear wheel drive BMW layout with its near perfect 50:50 weight distribution - but never quite managed to deliver a package with the same kind of involving finesse. This car shares many of its fundamentals with the 6th generation version of the Munich maker's 3 Series model, but has a lower ride height that comes courtesy of a wider front and rear track, hunkering the body better down into the road and lowering its centre of gravity. It helps that feedback from the tactile, pleasantly chunky three-spoke sports steering wheel is far better than you fear an electric steering system might offer - or at least it is in this revised model. Steering is one of the things that the engineers focused on most in updating this facelifted 4 Series and their efforts paid off, weight through the helm here building in a way that makes it easier to take every corner with just one fluid sweep of the wheel.
The suspension was also revised as part of the 2017 update, the standard passive set-up as a result being firmer than before. That slightly increased take-up of the 'Adaptive M Sport Suspension' variable damping set-up we'd recommend. As with the original version of this car, a 'Drive Performance Control' system tweaks response from the throttle, the steering and the optional 8-speed auto gearbox to suit the way you want to drive. Engine-wise, most buyers choose one of the base 2.0-litre variants, either the 184bhp 420i petrol model or the 190bhp 420d diesel, a variant capable of up to 62.8mpg and 119g/km of CO2 in manual guise (NEDC figures). From new, both derivatives could be ordered with xDrive 4WD as an option. Need more power? Diesel folk are offered two six cylinder auto-only variants, the 258bhp 430d and the 313bhp 435d. Petrol people get a 2.0-litre 430i model tuned up to 252bhp and two six cylinder options, the 326bhp 440i and the 431bhp M4.
If you're looking for a mid-sized premium badged executive sports coupe from the 2017 to 2020 period, this BMW 4 Series Coupe is still the car in this class that does it all, the sector benchmark, the go-to choice in its segment. Especially if you're the kind of driving enthusiast this model has traditionally appealed to. Can it be criticised? Perhaps. Some have found it a rather overly mature proposition, but we think that these are people who would probably be better suited by BMW's smaller 2 Series two-door model.
What's not up for debate is that here, BMW built a benchmark contender in this class. That sounds rather clinical doesn't it, so let's allow the Munich maker's marketing men to have the last word. This car, they reckoned, was more than just a 'love letter to performance'. Instead, it offered something deeper than that: the promise of a passionate affair. It still does.