2017 to 2021ConvertibleM Performance
Photo: HJUdall, public domain, via Wikimedia Commons
The F23 M240i Convertible shares the F22's B58 turbo six, but trades structural rigidity for open-air motoring.
Each part is scored from 0 to 100 on a fixed outside scale. Acclaim comes from published expert lists, launch reviews and awards; the more acclaimed a car, the less its ownership cost counts in this all-time score (its dollars below are unchanged). A part marked not measured carries no weight for this car, and the others share its weight.
No permitted price yet: we have not found three prices for this car from sources that allow this use.
Long-term value starts to count in the score once 75% of the 69 generations have permitted prices. Today 43 do.
About $1,893 a year to own ($1,291 to $2,973), about $8,606 over five years, bought at five years old or its own age if older, kept five years.
Expect about $1,300 to $3,000 a year; the bills that decide it are oil filter housing and valve cover gasket leaks, high pressure fuel pump and coolant loss / expansion tank. Ownership risk: low.
Guide Score method v5-final.14, an editorial score built only from permitted, sourced data. How it works.
Colors it came in, most wanted first. Pick one to see the page in it.
2017The best year to buy, reading 82 of 100, about $1,893 a year to own.
No logged change between model years sets it apart; every year reads within 2 points of it, so buy on condition and records.
No year to think twice about: none reads 3 or more points below the 2017, and no logged fault separates them.
From our log of the changes between model years, each with its source. Only changes the score reads count as reasons; recalls BMW fixes for free, options and tuning notes do not. The cost a year is for a car bought at five years old, or its own age if older, kept five years. How the score works.
The convertible is about 270 to 290 lb heavier, flexier and more cruiser focused, and it appeals to a different buyer than the coupe.
What goes wrong on this generation, roughly what a fix costs at an independent shop, and how to spot it before you buy. Every M240i generation compared.
Look for oil or coolant residue at the oil filter housing and the valve cover, and ask about coolant top-ups.
Ask about tune history and fueling upgrades, listen for HPFP whine at idle.
Ask whether walnut blasting has been done, budget for it on higher mileage cars.
Ask whether the valve was replaced under SI B01 14 23; within 15 years and 150,000 miles a BMW dealer fixes it free.
The low temperature cooling system, expansion tank, and water pump are the typical B58 weak spots. Loss can be slow.
Inspect the expansion tank seams, ask owner about coolant top-ups.
The plastic oil filter housing and its gaskets can leak oil or coolant, often from about 60,000 miles, and the valve cover gasket can weep. A proposed class action filed in January 2026 covers 2014 to 2021 BMWs with this engine family; BMW has moved to dismiss it, and no class has been certified. Both jobs take many hours of labor.
Look for oil or coolant residue at the oil filter housing and the valve cover, and ask about coolant top-ups.
The crankcase ventilation (PCV) valve's diaphragm in the valve cover can split, causing blue-white smoke after a cold start, a whistle at idle, misfire codes and sometimes limp mode. BMW NA covers this valve for 15 years or 150,000 miles on M240i convertibles built June 2016 to July 2021 (SI B01 14 23).
Ask whether the valve was replaced under SI B01 14 23; within 15 years and 150,000 miles a BMW dealer fixes it free.
Intake valve carbon deposits build up over time on this direct injection engine and are removed by walnut blasting. One repair shop that sells the service says cleaning is typically needed every 50,000 to 70,000 miles; BMW schedules no such service.
Ask whether walnut blasting has been done, budget for it on higher mileage cars.
The engine-driven high pressure fuel pump can wear, bringing poor running and fuel pressure fault codes. No source we read reports a pattern of failures on this first version of the engine, and BMW has issued no bulletin on pump wear.
Ask about tune history and fueling upgrades, listen for HPFP whine at idle.
BMW of North America, LLC (BMW) is recalling certain 2021 2 Series (230i, 230i xDrive, M240i, M240i xDrive), 330e, 330e Xdrive, 4 Series Coupe (430i, 430i xDrive, M440i xDrive) M4 Coupe, M4 Competition Coupe, BMW 4 Series Convertible (430i, M440i), BMW X1 sDrive28i, xDrive28i, 2 Series Gran Coupe (228i, 228i xDrive, M235i xDrive), M2 Competition Coupe, 330i, 330i xDrive, M340i, M340i xDrive, M3, M3 Competition, 530i, 530i xDrive, 540i, 540i xDrive, MINI Hardtop 2 Door (Cooper, CooperS, JCW), X2 sDrive28i, X2 xDrive28i, X2 M35i, Z4 sDrive30i, Z4 M40i, MINI Hardtop 2 Door (Cooper SE), MINI Convertible (Cooper, Cooper S, JCW), MINI Clubman (Cooper S, Cooper S All4, JCW), MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), Rolls Royce Ghost, MINI Countryman (Cooper S E All4), Rolls Royce Phantom, Rolls Royce Cullinan, and Toyota Supra vehicles. The passenger seat belt Automatic Locking Retractor (ALR) may deactivate early, before the webbing fully retracts. As such, these assemblies fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
BMW of North America, LLC (BMW) is recalling certain 2021 BMW 230i and M240i vehicles. Supports within the roof liner may be insecurely attached.
BMW of North America, LLC (BMW) is recalling certain 2019-2020 230i, 230i xDrive, M240i, M240i xDrive, M2 Competition Coupe, 430i, 430i xDrive, 440i, 440i xDrive, M4, and 2019 330i xDrive Sportswagon vehicles. The driver and passenger knee air bag assemblies may have been improperly folded and assembled.
BMW of North America, LLC (BMW) is recalling certain 2018 BMW 540d xDrive vehicles. The crankshaft sensor may be equipped with incorrect firmware, preventing the sensor from properly processing input from the crankshaft reluctor ring, possibly resulting in a vehicle stall. On September 12, 2018, BMW expanded the recall to a total of 5,309 vehicles including certain 2018-2019 BMW 540d xDrive, 230i M240i, M240i xDrive, X2 sDrive28i, X2 xDrive28i, X1 sDrive28i, X1 xDrive28i, 330i, 330i xDrive, 340i, 340i xDrive, 330i xDrive Gran Turismo, 530i, 530i xDrive, 540i, 540i xDrive, 530e, 530e xDrive, 640i xDrive Gran Turismo, 330e, 2019 430i Gran Coupe, 430i xDrive Gran Coupe, 440i Gran Coupe, 440i xDrive Gran Coupe, 430i, 430i xDrive, 440i, 440i xDrive, 740i, 740i xDrive, MINI Cooper, Cooper S, JCW, MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), and MINI Clubman (Cooper, Cooper S, Cooper All4, Cooper S All4, JCW All4) vehicles.
BMW of North America, LLC (BMW) is recalling certain 2018 230i, 230i xDrive, M240i, M240i xDrive, M2, and X3 xDrive 30i SAV vehicles. These vehicles may have an error in the software for the instrument panel, causing the display to not properly illuminate. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 101, "Control and Displays."
Live from NHTSA, across the 2017 to 2021 model years.
Our estimates at an independent shop, parts and labor; fuel from the EPA.
Pricing tires for this car? Compare the factory sizes at Discount Tire, and ask a local shop to match it.
Fuel from EPA fueleconomy.gov: its yearly cost is for 15,000 miles with 55% city driving, moved here to the miles a year the two-year budget uses. The rest are our estimates at independent-shop and retail prices from September 2026. Service is a year of routine maintenance at 10,000 miles: one or two oil changes, brake fluid, filters, and spark plugs spread over their interval. Repairs are separate. Tires are a mounted set of summer tires; brakes are pads and rotors on both axles. Prices vary by region and shop.
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The cars this one gets weighed against, by lineage and by price.
The M Index, once a month: any change to the M240i's guide or score, with the reason, new recalls on M cars, and one thing to check before you buy.