Convertible Petrol 8-Speed Automatic RWD 4-seat

BMW 4 Series Convertible 420i Convertible M Sport

Price in South Africa, real specs & fuel economy — 2026

Model year 2026 Generation G23 four-seat premium convertible related to the G22 Coupé but with body- and roof-specific packaging. Current version Original current-generation version Body style Convertible
The 420i Convertible M Sport is the balanced 135 kW soft-top for buyers prioritising open-air touring.
ZAR 1,146,500
On-road in
ZAR 1,175,997
What makes up this price?
Vehicle price (ex-showroom)
ZAR 1,146,500
Registration allowance
ZAR 4,800
Licensing allowance
ZAR 2,000
Inspection / roadworthy allowance
ZAR 1,300
Dealer handling / delivery
ZAR 4,200
Insurance
ZAR 17,198
Other fees
ZAR 0
Ex-showroom ZAR 1,146,500
Estimated finance from ZAR 20,123/month Ex-showroom basis · approx. 20% deposit · 11.5% p.a. · 60 months · no balloon
Engine:1998cc (2.0L) Torque:300Nm (221 lb-ft) Ground Clearance:140mm (5.5″) Power:135kW (181 bhp) Boot300L (10.6 cu ft)

Hover or tap any pill for a plain-English explanation. Bracketed values show common equivalents (bhp, lb-ft, inches, cu ft).

Fuel Economy km/l · US mpg equivalent
Combined 12.5 km/l (29 mpg)
City 10.5 km/l (25 mpg)
Highway 15.0 km/l (35 mpg)

On-road pricing varies by dealer. Fuel figures are manufacturer claims or source-backed estimates where a separate city/highway cycle is not published; your real numbers depend on traffic, terrain and driving style.

Model Range PDF See comparisons with similar cars
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Estimate monthly vehicle finance for the BMW 4 Series Convertible 420i Convertible M Sport in South Africa. The default illustration uses the ex-showroom price, approximately 20% deposit, 11.5% nominal annual interest over 60 months and no balloon payment.

Estimated monthly instalment
ZAR 20,123
Total Interest
ZAR 292,394
Total Payable
ZAR 1,207,394
Principal Interest

* Illustrative estimate based on the ex-showroom price, approximately 20% deposit, 11.5% nominal annual interest, 60 months and no balloon payment. Excludes initiation fees, monthly service fees, credit-life insurance and vehicle insurance. Your lender quotation may differ.

Vehicle specifications and buying guidance • Hagalu

BMW 4 Series Convertible 420i Convertible M Sport

The 420i Convertible M Sport is the balanced 135 kW soft-top for buyers prioritising open-air touring.

BMW 420i Convertible M Sport places the open-roof experience ahead of maximum engine output. Its official South African specification records a 135 kW and 300 Nm petrol engine through an eight-speed automatic and rear-wheel drive. This is enough for relaxed urban travel, coastal routes and planned highway overtaking. M440i xDrive adds much more performance, but 420i can be the more coherent convertible when the roof itself is the primary reason to buy. The fabric roof changes ownership. Operate it several times, confirm permitted conditions and learn what to do if movement is interrupted. Inspect fabric, seals and drains at delivery, follow approved cleaning guidance and use secure covered parking where possible. Sap, bird contamination and coastal exposure need prompt attention. Roof care is not a cosmetic hobby; it protects weather sealing and long-term value. Luggage must be tested with the roof folded. The boot arrangement, divider and wind equipment can reduce useful space. Pack a real weekend and place any regular rear passenger behind the front seats. Long doors and low access make the rear occasional. Conversation, wind and sun also change when open, so every passenger should experience a roof-down drive rather than decide from a stationary car. Petrol and automatic operation suit mixed use. Official consumption is a comparison value affected by congestion, speed, roof position, wind, load, wheels and style. The 420i does not need to be driven hard to make the Convertible special. Ride comfort and quiet roof-up travel may create more lasting satisfaction than a large wheel. M Sport equipment varies with build. Confirm wheels, seats, cameras, wind deflector, assistance, paint and roof finish. Drive rough tar and motorway speed with roof raised, listening around seals. Open it on a safe route and assess airflow. Pair phones and use climate controls. Insurance must record the exact 420i Convertible rather than a Coupé or M440i. Keep roof, service, tyre and build records. The car has no rough-road role. Dust and stones harm paint, wheels and roof mechanisms, while rear-wheel drive adds no clearance. The 420i succeeds as a usable leisure car for an owner who will open and maintain it. A Convertible left closed outside while carrying too much luggage is the wrong body, regardless of the sensible engine.

BMW 4 Series Convertible — Quick Facts

BMW 4 Series Convertible Variants & Prices

Pick up to 3 variants, hit Compare Variants and you'll get a proper side-by-side spec breakdown.

Maximum 3 variants reached
Uncheck one of the selected variants below before choosing another.
Cmp Variant Trim Fuel Efficiency / range Transmission Price
420i Convertible M Sport M-Sport Petrol Efficiency12.5 km/l 8-Speed Automatic ZAR 1,146,500
M440i xDrive Convertible M-Performance Petrol Efficiency12.5 km/l 8-Speed Automatic ZAR 1,642,500
Cmp Variant Trim Fuel Efficiency / range Transmission Price
420i Convertible M Sport M-Sport Petrol Efficiency12.5 km/l 8-Speed Automatic ZAR 1,146,500
M440i xDrive Convertible M-Performance Petrol Efficiency12.5 km/l 8-Speed Automatic ZAR 1,642,500
2 variants selected

BMW 4 Series Convertible Specifications

Showing all 219 non-empty supported buyer-facing fields for 420i Convertible M Sport. Blank contract fields are not fabricated.

Model Introduced Year
2020
Body Style
Convertible
Generation
G23 four-seat premium convertible related to the G22 Coupé but with body- and roof-specific packaging.
Model Year
2026
Production Status
active
Segment
Premium Convertible
Vehicle Type
Car
Facelift Version Ending
Current
Facelift Launched Since
Original current-generation version
Facelift History
Current updated G23-generation BMW 4 Series Convertible offered in South Africa with a fabric soft top.
Length
4768 mm
Width
1852 mm
Height
1384 mm
Wheelbase
2851 mm
Ground Clearance (Default)
140 mm
Ground Clearance (With Full Seating Load)
125 mm
Fuel Tank Capacity
59 l
Boot/Cargo Space
300 l
Kerb Weight
1765 kg
Gross Vehicle Weight (GVW)
2185 kg
Payload Capacity
495 kg
Towing Capacity
1600 kg
Seating Capacity
4 seats
Number of Rows
2 rows
Doors
2 doors
Minimum Turning Radius
5.6 m
Front Headroom
998 mm
Rear Headroom
956 mm
Front Legroom
1031 mm
Rear Legroom
900 mm
Engine
BMW turbocharged engine
Engine Code
B48
Fuel Type
Petrol
Hybrid System
Not Applicable
Engine Displacement
1998 cc
Cylinders
4
Cylinder Layout
Inline
Valves
16
Valves per Cylinder
4
Aspiration
Turbocharged
Fuel System
Direct injection
Compression Ratio
10.5:1
Bore
82.0 mm
Stroke
94.6 mm
Maximum Power
135 kW
Maximum Torque
300 Nm @ 1350-4000 rpm
Combined Power
Not Applicable
Combined Torque
Not Applicable
Motor Type
Not Applicable
Number of Motors
Not Applicable
Motor Location
Not Applicable
Drive Type
RWD
Transmission
8-Speed Automatic
Top Speed
236 km/h
0-100 km/h
8.2 sec
Quarter Mile
15.5 sec
Drive Modes
Eco, Comfort, Sport
Launch Control
No
Rev Limiter
6500 rpm
Power-to-Weight Ratio
100 kW/tonne
Torque-to-Weight Ratio
220 Nm/tonne
Battery Capacity
Not Applicable
Usable Battery Capacity
Not Applicable
Battery Type
Not Applicable
Battery Voltage
Not Applicable
Electric Range
Not Applicable
AC Charging Power
Not Applicable
DC Charging Power
Not Applicable
AC Charging Time
Not Applicable
DC Charging Time
Not Applicable
Regenerative Braking
Not Applicable
LSD Available
Not Applicable
Gearbox
8-Speed Automatic
Drivetrain Layout
Rear-wheel drive
Transfer Case
Not Applicable
Differential Lock
Not Applicable
Paddle Shifters
Yes
Transmission Speeds
8
Rear Differential Lock
Not Applicable
Drivetrain
RWD
Axle Layout
Yes
Low Range
Not Applicable
Low Range Ratio
Not Applicable
Gearbox Type
Automatic
Front Differential Lock
Not Applicable
Automatic Shift Paddles
Yes
Final Drive Ratio
Yes
Number of Gears
8
Transmission Type
Automatic
Clutch Type
Yes
4WD Selector
Not Applicable
4WD Lo Range
Not Applicable
4WD Hi Range
Not Applicable
4WD Engagement
Not Applicable
Gear Shift Type
Automatic selector
Gear Shift Indicator
Yes
Range Real World Mixed
420 km
Electric Consumption
Not Applicable
Charging Type
Not Applicable
Charging Port Type
Not Applicable
Combined Driving Range
Not Applicable
Range Real World Highway
360 km
Real-world Mileage
12.0 km/l
Fuel Tank Litres
59
Auto Start Stop
Standard
AdBlue Tank Capacity
Not Applicable
Emission Standard
Euro 6
Fuel Tank Capacity
59 l
Highway Mileage
15.0 km/l
City Mileage
10.5 km/l
Claimed Mileage
12.5 km/l
Brake Assist
Standard
ISOFIX Mounts
Standard
Child Safety Lock
Standard
Hill Start Assist
Standard
Hill Descent Control
Yes
Traction Control
Standard
Electronic Stability Control
Standard
ABS
Standard
Airbags
6
Engine Immobiliser
Standard
ABS EBD
Standard
BA
Standard
Seatbelt Warning All Seats
Standard
Front Parking Sensors
Yes
TCS
Standard
Stability Control
Standard
Side Airbags
Yes
Seatbelt Reminder
Standard
Brake Override System
Yes
Curtain Airbags
Yes
Seatbelt Pretensioners
Yes
Rear Cross Traffic Alert
Yes
Knee Airbag
Yes
Passenger Airbag
Yes
Hill Hold
Yes
AEB
Yes
Driver Airbag
Yes
EBD
Standard
Engine Immobiliser
Standard
Tyre Pressure Monitor
Standard
Park Assist
Standard
Cruise Control
Standard
Adaptive Cruise Control
Yes
Lane Keep Assist
Yes
Lane Departure Warning
Yes
Blind Spot Monitoring
Yes
Rear Cross Traffic Alert
Yes
Parking Sensors
Yes
Rear View Camera
Yes
360 Degree Camera
Yes
Autonomous Emergency Braking
Yes
Driver Fatigue Alert
Yes
Traffic Sign Recognition
Yes
Auto Highbeam
Standard
Auto Wipers
Yes
Rear Parking Sensors
Yes
Reverse Camera
Yes
Adaptive Cruise Control
Yes
Around View Monitor
Yes
Blind Spot Warning
Yes
Forward Collision Warning
Yes
Ambient Lighting
Standard
Passenger Seat Adjustment
Electric multi-way
60 40 Split Seat
Yes
Driver Seat Adjustment
Electric multi-way
Seat Trim
Yes
Steering Wheel Material
Steering wheel M Leather
Heated Seats
Front
Ventilated Seats
Yes
Seat Material
Leather 'Vernasca' Black with contrast stitching Blue
Keyless Entry
Yes
Climate Control
Standard
Power Windows
Standard
Push Button Start
Yes
Wireless Charging
Yes
Sunroof
Panoramic
Electric Tailgate
No
Rain Sensing Wipers
Yes
AC Type
Automatic air conditioning
Android Auto
Yes
Touchscreen
Yes
USB Ports
2
Infotainment System
Widescreen Display
Bluetooth Connectivity
Yes
Number of Speakers
6
Apple CarPlay
Yes
Infotainment Screen
14.9
Digital Instrument Cluster
12.3
Roof Rails
Yes
Exterior Colour Options
Multiple manufacturer colours
Fog Lamps
Yes
Headlights
Yes
Daytime Running Lamps
Standard
LED Headlamps
Yes
Panoramic Sunroof
Yes
Terrain Modes
Not Applicable
Wading Depth
Not Applicable
4WD System Type
Not Applicable
Breakover Angle
Not Applicable
Approach Angle
Not Applicable
Departure Angle
Not Applicable
Locking Differential
Not Applicable
Front Brake Type
Ventilated disc
Handbrake Type
Electronic
Tyre Size
Runflat tyres
Rear Brake Type
Disc
Spare Wheel Type
Tyre repair kit
Wheel Rim Size
18" M Lt/Aly wheels Double-spoke style 848 M Bicolour/emerg. runn. properties
Rear Suspension
M Sports Suspension
Front Suspension
M Sports Suspension
Service Plan
5 years / 100000 km BMW Motorplan
Warranty
Yes
CO2 Emissions
163 g/km
Pricing Role
Current recommended retail price
Price Zar
1146500 ZAR
Ownership Role
Private and enthusiast
Starting Price
1146500
Starting Price Zar
1146500

Imported source and record fields

19 non-empty identity, provenance, and legacy source fields are retained here for review. They are not mixed into the buyer-facing specification table. The supplied pack has no values for 575 of the 813 specification-contract fields on this page, so those blank fields remain omitted.

Market
South Africa
Brand
BMW
Brand Slug
bmw
Country
South Africa
Country Slug
south-africa
Make
BMW
Model
4 Series Convertible
OEM URL
https://www.bmw.co.za/en/all-models/4-series/4-series-cabrio/bmw-4-series-convertible.html
Source Name
BMW South Africa official technical data and range information
Source Page URL
https://www.bmw.co.za/en/all-models/4-series/4-series-cabrio/bmw-4-series-convertible-technical-data.html
Source URL
https://www.bmw.co.za/en/all-models/4-series/4-series-cabrio/bmw-4-series-convertible-technical-data.html
Variant
420i Convertible M Sport
Fuel Economy Combined
7.1
Fuel Efficiency
1 l/100km
Combined Consumption L 100km
7.1 l/100km
Combined Consumption
7.1
Claimed Fuel Consumption
7.1 l/100km
Average Fuel Consumption
7.1
Price Source
BMW South Africa July 2026 recommended retail price list
Driving fit

Where the BMW 4 Series Convertible Fits Best

A practical view of the buyer and roads this model is best suited to.

Who buys this

The 420i Convertible fits an individual or couple with secure covered storage who will use the roof frequently and prefers relaxed touring to high-performance costs. Rear seats and boot are occasional-use assets, not family-car strengths. The owner accepts fabric care, wind management and long doors, and values a comfortable wheel over maximum visual drama.

City
The automatic and petrol engine handle mixed commuting without demanding M440i output. Test long doors, cameras, basement ramps and roof operation in the home bay. Open driving increases sun, dust and security exposure, so hide belongings and use the roof appropriately. Large wheels need a pothole check. Learn climate and roof controls, and ensure the fabric is not left beneath contaminating trees for long periods.
Highway
Drive at legal motorway speed with the roof raised to assess sealing, tyre noise and seat comfort. Then use a safe roof-down section to judge wind and conversation. Pack luggage with the roof stowed and fit the wind deflector. The 135 kW engine supports planned overtaking; speed cannot compensate for fatigue or poor weather. Carry tyre-support information and suitable sun and hearing protection for occupants.
Off-Road
A soft-top 4 Series is unsuitable for rough travel. Low bumpers, road tyres, dust-sensitive seals and exposed cabin surfaces favour tar. A short maintained gravel entrance may be crossed slowly with the roof raised, but stones and corrugations risk paint, wheels and mechanisms. Deep ruts or water are inappropriate. Frequent rural access is a reason to use another vehicle rather than regard a leisure Convertible as an adventure car.
3.8/5
Hagalu editorial score 3.8 out of 5 Reviewed by Hagalu Editorial Team · 2026-09-28

BMW 4 Series Convertible 420i Convertible M Sport — Should You Buy It?

3.8/5
BMW 4 Series Convertible 420i Convertible M Sport: buyer assessment
Hagalu editorial review by Hagalu Editorial Team · 2026-09-28

Audit the parking space before the engine. Operate the roof at home, confirm clearance and inspect care requirements. Pack luggage with the roof folded, seat any rear passenger and test the wind deflector. Request the factory build sheet and verify wheels, cameras, seats and roof finish. Drive rough city tar and roof-up highway speed, then sample open travel under safe conditions. Price insurance for 420i Convertible M Sport and retain photographs, roof, tyre and service records. Compare M440i only if six-cylinder performance is independently valuable. The 420i is right when the owner wants a convertible first, can protect it and accepts its packaging. It is wrong when the roof remains unused or household tasks demand a fixed-roof liftback. BMW 420i Convertible M Sport places the open-roof experience ahead of maximum engine output. Its official South African specification records a 135 kW and 300 Nm petrol engine through an eight-speed automatic and rear-wheel drive. This is enough for relaxed urban travel, coastal routes and planned highway overtaking. M440i xDrive adds much more performance, but 420i can be the more coherent convertible when the roof itself is the primary reason to buy. The fabric roof changes ownership. Operate it several times, confirm permitted conditions and learn what to do if movement is interrupted. Inspect fabric, seals and drains at delivery, follow approved cleaning guidance and use secure covered parking where possible. Sap, bird contamination and coastal exposure need prompt attention. Roof care is not a cosmetic hobby; it protects weather sealing and long-term value. Luggage must be tested with the roof folded. The boot arrangement, divider and wind equipment can reduce useful space. Pack a real weekend and place any regular rear passenger behind the front seats. Long doors and low access make the rear occasional. Conversation, wind and sun also change when open, so every passenger should experience a roof-down drive rather than decide from a stationary car. Petrol and automatic operation suit mixed use. Official consumption is a comparison value affected by congestion, speed, roof position, wind, load, wheels and style. The 420i does not need to be driven hard to make the Convertible special. Ride comfort and quiet roof-up travel may create more lasting satisfaction than a large wheel. M Sport equipment varies with build. Confirm wheels, seats, cameras, wind deflector, assistance, paint and roof finish. Drive rough tar and motorway speed with roof raised, listening around seals. Open it on a safe route and assess airflow. Pair phones and use climate controls. Insurance must record the exact 420i Convertible rather than a Coupé or M440i. Keep roof, service, tyre and build records. The car has no rough-road role. Dust and stones harm paint, wheels and roof mechanisms, while rear-wheel drive adds no clearance. The 420i succeeds as a usable leisure car for an owner who will open and maintain it. A Convertible left closed outside while carrying too much luggage is the wrong body, regardless of the sensible engine.

Desk research: Scored from verified published sources and Hagalu's South African buyer analysis; this vehicle was not road-tested for this review. This is a Hagalu editorial score, not a customer rating.

Safety 4.2/5 · 20%
4.2/5
Value 3.9/5 · 20%
3.9/5
Practicality 2.9/5 · 20%
2.9/5
Ownership 3.8/5 · 15%
3.8/5
Powertrain suitability 4.1/5 · 15%
4.1/5
Comfort & technology 4.1/5 · 10%
4.1/5

Evidence reviewed: Hagalu maintains the detailed source record internally so this page does not promote third-party vehicle websites.

How this score is calculated · Methodology v1.0

The sensible open 4 Series for owners who will use and protect the roof rather than chase excess output.

420i Convertible M Sport combines adequate 135 kW petrol performance with the defining fabric roof. Its success depends on secure storage, roof care, roof-down luggage testing and acceptance of rear-seat limits. It avoids the M440i’s higher running costs without diminishing open-air enjoyment. Buyers who verify the exact build and preserve ride comfort can use it through the week and still make a leisure journey feel distinct.

What's Good
  • ✓Balanced 135 kW engine
  • ✓Fabric-roof experience
  • ✓Eight-speed automatic
  • ✓Lower costs than M440i
  • ✓Roof-up daily usability
Watch Out For
  • ✕Variable boot space
  • ✕Rear access is limited
  • ✕Roof needs care
  • ✕Long doors
  • ✕No rough-road role

BMW 4 Series Convertible FAQs

The current recommended retail price listed for the BMW 4 Series Convertible 420i Convertible M Sport is R1,146,500. This is the vehicle price before finance interest, insurance, registration and any dealer-added options.

The current south african range comprises 420i Convertible M Sport, M440i xDrive Convertible. Prices and equipment are shown by derivative so buyers can compare the actual local range rather than specifications from another market.

The listed ground clearance for the BMW 4 Series Convertible 420i Convertible M Sport is 140 mm. Use that number as a practical comparison point against similar cars, especially if you regularly deal with steep driveways, gravel roads or uneven parking areas.

The listed engine capacity for the BMW 4 Series Convertible 420i Convertible M Sport is 1998 cc, with output shown as 135 kW (181 bhp). Where a model has more than one derivative, compare the specific variant because fuel type, gearbox and drivetrain can change the way it drives.

The combined fuel-economy figure shown for the BMW 4 Series Convertible 420i Convertible M Sport is around 12.5 km/l.

The 420i Convertible fits an individual or couple with secure covered storage who will use the roof frequently and prefers relaxed touring to high-performance costs. Rear seats and boot are occasional-use assets, not family-car strengths.

The automatic and petrol engine handle mixed commuting without demanding M440i output. Test long doors, cameras, basement ramps and roof operation in the home bay.

Drive at legal motorway speed with the roof raised to assess sealing, tyre noise and seat comfort. Then use a safe roof-down section to judge wind and conversation.

Buyers researching the BMW 4 Series Convertible often compare it with rivals such as MG Cyberster , Mercedes-Benz CLE Cabriolet . Comparing them side by side is the quickest way to see where your money goes — performance, fuel use, price and running costs can differ substantially.

Compare BMW 4 Series Convertible with Similar Convertibles

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Data verified against: BMW Official South Africa Website

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