Road tests

New BMW 4 Series 2020 review

Is the most basic 420i model the sweet spot in new BMW 4 Series range?

Overall Auto Express Rating

4.5 out of 5

Find your BMW 4 Series
Offers from our trusted partners on this car and its predecessors...
Or are you looking to sell your car?


You’ll either love or loathe those looks, but there’s no arguing with what a brilliant all-rounder the latest 4 Series proves to be. The criticisms we have of this entry-level 420i – an engine that’s good rather than phenomenal, and steering that could do with a touch more feedback – are so minor that they’re easy to forgive. We’ll soon pit the 4 Series against its competition to find where it truly stands, but at the moment it looks like BMW is onto a winner. 

We had two main takeaways from our first encounter with the new BMW 4 Series. First is that in range-topping M440i xDrive trim, it’s deeply impressive. The second is that the shock of those looks – and the huge vertical kidney grilles in particular – still hasn’t sunk in.

Now back in the UK and driving the 420i variant, it’s clear that the face will still take some getting used to. But we’ll all get over it eventually, especially when it’s so clear that BMW has created a talented two-door.

With M Sport trim consistently the most popular among British buyers of the last 4 Series, it’s the only trim level available this time. That means firmer M Sport springs and dampers are standard, along with more rigid suspension mountings, extra chassis bracing, thicker anti-roll bars and more negative camber than the 3 Series.

Many of the components are made from aluminium. The double-joint spring-strut front axle, for example, is 30 per cent lighter than an equivalent steel item as a result, while the optional adaptive dampers fitted to the cars we sampled gave the driver a little scope to tweak the chassis response in favour of either firmness or comfort.

Regardless of the setting, the 4 Series delivers a class-leading balance. As much as the range-topping M440i left us deeply impressed, it’s arguably at the bottom end of the range where the 4 Series at its best. Turn the car into a corner, and the 420i rotates instantly around the driver’s hips; the apparent lack of inertia makes it feel sharp and agile, yet stable and predictable.

It rides sweetly, too. The mix of 18-inch wheels and adaptive dampers rounds off bumps beautifully, and the lack of rattles or crashiness across the worst surfaces only highlights what a rigid structure those components are attached to.

If there is a weak point to be found among the driving dynamics, it’s that the steering could do with having a little more feel. It’s not helped by BMW’s love of needlessly thick, squidgy steering wheel rims, but it ultimately lacks detail. In its heftiest setting, it’s also rather at odds with the rest of the car’s responsiveness. Still, the rack is certainly very precise, and at least a match for anything else in the class.

One further small criticism is that the 2.0-litre turbocharged engine doesn’t seem quite as muscular as the 7.5-second 0-62mph time suggests. With so few miles under the wheels of our test car, it could just be a case of the engine needing to loosen up, but the diesel-powered 420d (with only 6bhp more, but more significantly 100Nm extra torque) offers more punchy real-world performance.

Need to sell your car?
Find your best offer from over 5,000+ dealers. It’s that easy.

What’s not in doubt is that, even at the range’s lower end, the 4 Series’ refinement and smoothness are beyond question. Every model has the same automatic gearbox, and it’s happy to shuffle through its eight ratios imperceptibly when pottering about, yet snaps into ratios when pressing on. It helps the car settle to an easy cruise, too.

And the cabin is a lovely place to while away those miles. The dashboard is pretty much identical to the 3 Series’, and that’s no bad thing: it looks smart, is sturdy in all the right places, and has a smart infotainment system that now finally features Android Auto as well as Apple CarPlay. Obviously the rear seats don’t offer the same accommodation as the 3 Series’, but they’re on a par with rivals.

Standard equipment is generous, and every 4 Series gets alloy wheels at least 18 inches in diameter, LED headlights, leather upholstery, a 10.25-inch infotainment system and a 12.3-inch digital driver’s display. For the first time, front collision warning and lane-departure warning systems are standard on a 4 Series, too.

Benefit-in-kind tax rates of between 32 and 33 per cent mean that this 420i is unlikely to be the first choice for company car buyers, especially when the 420d drops into the 23-25 per cent range. At £40,460, however, the petrol model is cheaper than the diesel to the tune of £2,630.

That starting figure makes the BMW slightly pricier than its closest rivals from Mercedes and Audi, too. However, there’s more to it than that; the entry-level A5 35 TFSI is 33bhp down on the BMW. This sounds like a substantial amount when, with the pair matched up on equivalent four-year PCP deals, the Audi is only £16 per month cheaper on a four-year deal.

Model: BMW 420i M Sport
Price: £40,460
Engine: 2.0-litre 4cyl turbocharged petrol
Power/torque: 181bhp/300Nm
Transmission: Eight-speed automatic, rear-wheel drive 
0-62mph: 7.5 seconds
Top speed: 149mph
Economy: 42.2mpg
CO2: 153g/km
On sale: Now
Chief reviewer

Alex joined Auto Express as staff writer in early 2018, helping out with news, drives, features, and the occasional sports report. His current role of Chief reviewer sees him head up our road test team, which gives readers the full lowdown on our comparison tests.

Most Popular

New Jaguar XF Sportbrake 2024 review: big estate with value boost
Jaguar XF Sportbrake - front tracking
Road tests

New Jaguar XF Sportbrake 2024 review: big estate with value boost

Jaguar's XF Sportbrake may be 8 years old but it just got a whole lot cheaper!
7 Dec 2023
Deal of the Day: Volkswagen ID. Buzz brings retro-style and practicality for £311 per month
Volkswagen ID. Buzz - front cornering

Deal of the Day: Volkswagen ID. Buzz brings retro-style and practicality for £311 per month

All-electric MPV offers style and substance - making it our Deal of the Day for Wednesday 6 December
6 Dec 2023
Toyota Yaris review
Toyota Yaris - front tracking
In-depth reviews

Toyota Yaris review

An efficient hybrid powertrain and plenty of standard kit make the Toyota Yaris a key contender in the supermini segment
6 Dec 2023