MINI Cabrio III (F57) (2015 – 2023)

Reliability score : 8.2/10

The MINI Cabriolet III (F57 generation) represents a significant leap in maturity, refinement, and reliability over its predecessor (R57). Built on BMW's UKL1 platform, it introduced the modular B-series engines, finally leaving behind the problematic Prince engines. While the convertible market is heavily dominated by petrol engines, MINI surprisingly offered two diesel variants (Cooper D and Cooper SD) in Europe between 2016 and 2019. These diesels offer exceptional fuel economy and strong mid-range torque, making them unique long-distance cruisers. However, a diesel convertible is a niche proposition: the clatter of a diesel engine is more noticeable with the roof down, and they require specific driving patterns (long trips) to prevent DPF and EGR issues. The F57 received two facelifts

✅ Strengths

Massive reliability improvement over the R57 generation (no more Prince engine timing chain nightmares).
Excellent soft-top mechanism with a unique 'sunroof' sliding function.
High-quality interior materials and BMW-derived infotainment system (iDrive).
Outstanding fuel economy on Cooper D and SD models.
Retains the signature MINI 'go-kart' handling despite the added weight of the convertible mechanism.

⚠️ Weaknesses

Diesel engine clatter detracts from the open-top experience.
Extremely limited trunk space (160 to 215 liters) and difficult access.
Rear seats are practically unusable for adults (very poor legroom).
Firm ride quality, especially on Cooper SD/S/JCW models with run-flat tires.
Poor rearward visibility when the roof is folded down.

🎯 Verdict

The MINI Cabriolet F57 is arguably the best-built and most reliable generation of the modern MINI. The decision to buy a diesel (Cooper D or SD) requires careful consideration. While the B37 and B47 engines are robust and offer incredible range, a diesel convertible is a paradox: the engine noise is unrefined with the roof down, and convertibles are often used as weekend city cars—the exact opposite of what a diesel needs to keep its DPF and EGR systems healthy. If you buy a diesel F57, ensure the EGR recall has been completed and that your driving profile includes regular highway trips. For most buyers, the petrol versions (Cooper or Cooper S) are a much better fit for the convertible lifestyle.