MINI has made great fanfare that it’s last new petrol engine will debut in 2025 as the brand transitions to all electric. It’s safe to say that that engine (or family of engines) will be the last MINI ever produces extending likely into the early 2030s. But what is this last engine range and is it something to be excited about? We have a few answers.

While we don’t have a full view of MINI’s plans we do know that there is a major revision to the current range coming in the form of mild hybrids. Based on what we’ve gleaned from product plans this may well MINI’s internal combustion swan-song

Mini Mild hybrid MINI’s Last Internal Combustion Engines

By adding the 48 Volt system and making other revisions we expect to see more power and torque along with necessary efficiency increases. Sources tell us to expect the B36/8 equipped MINIs to move up to 155 hp and the B46/8 (Cooper S) to see an increase to 200 hp. There’s no word on the JCW powerplant at this time.

What is a mild hybrid what would that do to MINIs? The system BMW and MINI are looking to use is known as mild because it is comprised only of a 48v electrical system, a dedicated battery and a starter generator specific to this system. The system relies on brake energy recuperation, which is stored in that dedicated battery. That powers the starter generator and ultimately the car in certain scenarios. 

What that means in the real world is much smoother auto stop-start transitions and more efficient coasting (BMW with a similar system do this up to 99 mph). But perhaps most interesting to many of us is the additional performance. BMW’s just released mild hybrid system can produce an extra 11 hp for short periods of time. 

The current B48 MINI engine.

The other obvious benefit is economy with this set-up intended offer a reduction in CO2 and improved MPG.

Given the enormous costs associated with transitioning the brand to electric BMW is looking to reduce spend in every way possible while maintaining the product we know and love. Because of that it’s a safe assumption that these revisions to the current range will indeed be the last “new” internal combustion engines MINI ever produces.

We’ll detail what this does to the manual transmission in future MINIs in an upcoming story.