Does the BMW 4 Series 420d have timing chain problems?

Early 420d models, from 2013 to around 2015, use the N47, known for timing chain wear. Those with the B47 are far more reliable here; confirm the engine from the year and the paperwork.

Does a diesel BMW 4 Series make sense for city driving?

Not much, because short trips stop the particulate filter from regenerating and eventually clog it. It is mainly a car for open-road driving; in town, a petrol 420i suits better.

Does a diesel BMW 4 Series pay more IUC in Portugal?

Yes, diesel cars pay an additional IUC charge compared with an equivalent petrol car. The final amount depends on engine size, CO2 emissions and the year of registration.

Cars

Used diesel BMW 4 Series in Portugal

Found 440 cars

From €8,500 to €89,000, half under €24,825 · Typically 2017 with 152,713 km. The 420d is the most frequent diesel 4 Series and, from around 2015, uses the B47 engine instead of the N47. The six-cylinder 430d and 435d pair strong torque with reasonable consumption, and the G22 adds AdBlue treatment and 48-volt mild-hybrid assistance.