
We had the 520d version on test that is powered by the same B48 1995cc four-cylinder turbo-diesel motor that also powers the smaller 3 Series. This aluminium motor makes a healthy 188bhp and 400Nm of torque.
Despite having an aluminium block, this diesel motor is one of the most refined four cylinder units that we have come across till date. It settles down to a quiet idle and even when you rev it out, it is difficult to tell that there is a diesel unit under the hood. Step on the gas and the immediate responses of the engine are quite impressive. The 520d accelerates in an extremely linear manner and this makes it deceptively quick. Unlike most diesels, the action is not only concentrated in the lower reaches of the power-band. This motor is very free-revving and visits to the red-line are pleasurable. The eight-speed automatic gearbox is on the money too. It makes the most of the engine’s power and the gearshifts are fast yet very smooth and precise with minimal jerks. In Sport mode, it hangs onto revs longer, kicks down faster, and in Sport Plus, through paddle shifters, you can hold on to every gear and decide when you want to shift.

Flat-out the new 520d takes just 7.8 seconds to reach 100kph, which makes it more than a second quicker than the old car. Thanks to the potent gearbox, the in-gear times even in eco-pro mode are pretty brisk. 20-80kmph takes a scant 4.60 seconds and the 40-100kmph sprint is completed in an equally impressive 6.21 seconds. Overall the 520d is plenty quick, but if you do want more performance then you can go for the 530d which has a 265bhp straight six diesel engine.

This new 5 Series has improved considerably in terms of dynamics. Where the old car would feel sloppy and nervous at high speeds, the 520d feels rock solid and straight-line stability is exceptional. Credit for the improved road manners not only goes to the new more rigid chassis but also to the fact that BMW is offering adaptive dampers standard across the 5 Series range.
At town speeds in Comfort mode the 520d simply excels thanks to its absorbent low speed ride despite the low profile 18-inch tyres. Well-judged spring rates help this German saloon feel supple yet well controlled. Even over rutted surfaces the suspension has surprisingly good level of crash-free bump absorption, you don’t feel most imperfections. Yes, there is some firmness at low speeds but it never gets to the point of feeling uncomfortable. Even at higher speeds the 520d shows good composure and this makes it a soothing highway companion. Even when you shift to Sport or Sport +, the damping remains remarkably supple which makes the 520d usable in any drive modes.

Through the corners the new 520d changes direction quite eagerly and unlike the old car there isn’t excessive body roll and it feels light on its feet. The light steering is smooth and accurate but is merely a tool for pointing the front wheels, with minimal feel for the tyre or road interface.