Independent, impartial advice for car buyers and car owners

Find an Expert Rating: 

BMW rolls out mild hybrid 3 Series, X3 and X4 models

German firm will roll out 48v technology across more of its range this year

Our Expert Partners

Motorway 600x300

Sell your car with Motorway
Find out more

Motors 600x300

Find your next car with Motors
Find out more

Leasing dot com 600x300

Car leasing offers from Leasing.com
Find out more

ALA Insurance logo 2022 600x300

Warranty and GAP from ALA Insurance
Find out more

MotorEasy logo 300x150

Warranty, servicing and tyres from MotorEasy
Find out more

Mycardirect subscriptions – 600x300

Carsubscriptions from Mycardirect
Find out more


BMW is expanding its range of mild hybrid-equipped vehicles to include the 3 Series, X3 and X4 model ranges.

The technology was first introduced to the German firm’s 5 Series range in autumn 2019 and will be rolled out to these new models in spring 2020.

The mild-hybrid powertrain is similar to a traditional hybrid in that it uses an electric motor and combustion engine, but this 48-volt electrical system cannot be used to drive the car, instead taking the load off the engine to improve fuel consumption.

This is achieved through the hybrid system running the car’s ancillaries, such as the air conditioning and stereo, while the car is stopped, coasting or slowing down, so the engine can be turned off. Energy is captured through brake energy regeneration to be deployed by the motor.

In the current 5 Series, it’s paired to a 190hp 2.0-litre turbo-diesel engine with the electric motor adding an additional 11hp under acceleration. While BMW hasn’t confirmed it, it’s likely the new models will use this existing mild-hybrid powertrain.

BMW says its Efficient Dynamics strategy – which sees the company focus on ‘consistently reducing fuel consumption’ through various areas such as reducing weight, improving aerodynamics and adding electrification – CO2 emissions across its fleet have reduced 40% in the past 13 years.

The latest from The Car Expert

Darren Cassey
Darren Cassey
Articles by Darren Cassey are provided for The Car Expert by PA Media (formerly the Press Association). They include test drives of the latest new cars and features on various aspects of automotive life.