About the BMW M135i
The BMW M135i was produced in two distinct generations. The first generation (F20/F21, 2012-2015) featured a rear-wheel-drive layout with a 3.0-litre turbocharged straight-six engine producing 316bhp, making it the only RWD hot hatch in its class. The second generation (F40, 2019-present) switched to a front-wheel-drive-based xDrive all-wheel-drive system with a 2.0-litre turbocharged four-cylinder engine producing 306bhp. Both versions offer 0-60mph times under 5 seconds and remain popular choices for enthusiasts seeking everyday usability with serious performance.
Standard equipment typically includes sports seats, adaptive suspension, performance brakes, and a comprehensive infotainment system. Optional extras such as the Harman Kardon sound system, sunroof, and adaptive LED headlights can significantly enhance the driving experience and affect resale values.
What Affects the Price of a Used BMW M135i
Model year is the primary price factor, with first-generation F20 models (2012-2015) ranging from £8,000 to £22,000, while second-generation F40 models (2019-onwards) command £28,000 to £55,000. The generational change reflects not just age but the fundamental drivetrain differences that appeal to different buyer preferences.
Mileage significantly impacts value. Low-mileage examples under 30,000 miles command premium prices, whilst high-mileage cars over 80,000 miles can be £5,000-£8,000 cheaper than average. Service history is crucial—full BMW service history with evidence of regular oil changes and maintenance of performance components adds considerable value. Cars with documented modifications or track use may be harder to sell unless professionally fitted and declared.
Specification variations matter considerably. Models with the optional LSD (limited-slip differential), upgraded brakes, and adaptive M suspension are more desirable. Desirable colours like Alpine White, Estoril Blue, and Sunset Orange hold value better than common shades. The presence of the Technology Pack, Professional Navigation, and reversing camera also influences pricing, particularly on earlier models where these weren't standard.
Tips for Buying a Used BMW M135i
Inspect the service history meticulously. The N55 engine in first-generation models is generally robust but requires regular oil changes every 10,000 miles maximum. Check for evidence of turbocharger, injector, or high-pressure fuel pump replacements. On F40 models, the B48 engine is newer but ensure the service schedule has been maintained. Listen for any unusual noises from the engine bay or turbocharger.
Examine the drivetrain carefully. On RWD F20 models, check the differential and propshaft for wear or leaks, and inspect the rear tyres for uneven wear indicating possible geometry issues. For F40 xDrive models, ensure the all-wheel-drive system engages properly during a test drive. A full BMW diagnostic check is advisable to identify any hidden fault codes, particularly relating to the turbocharger, emissions systems, and drivetrain sensors.
Test all performance features including the adaptive suspension settings, launch control, and sports exhaust if fitted. Check for excessive brake judder and measure remaining brake disc thickness. Interior wear on the driver's seat bolster and steering wheel can indicate higher use than the mileage suggests. Verify that any modifications have been professionally installed and that insurance implications have been addressed. Finally, budget for running costs—expect 25-30mpg in mixed driving, and premium fuel is essential for optimal performance.