Petrol
B48 serves the core four-cylinder range and B58 the M340i. Output, 48-volt system and emissions hardware changed by market and update stage.
3 Series (G20/G21/G28) — Sedan
2018–
Editorially reviewedReviewed 2026-08-10; market and model-year scope is stated in the record sources.
- Internal code
- G20
- Production
- November 2018 – present
- Body style
- 4-door sedan · 5 seats
- Platform
- CLAR · longitudinal engine · rear-wheel drive or xDrive · electrified derivatives
Body variants
3 Series → G20/G21/G28 → Sedan
3 Series G20/G21/G28: history, design and engineering
How this generation came about, what made it different and how the selected sedan fits into the family.
G20 returned the 3 Series to a sharper, more driver-focused brief while adding the digital cockpit and assistance systems expected of a modern executive car. Introduced in 2018, it uses BMW's modular CLAR architecture and keeps the familiar longitudinal layout, with rear-wheel drive at the centre of the range and xDrive on selected versions.
The family is deliberately narrower than earlier generations. G20 is the global Sedan, G21 is the Touring and G28 is the longer-wheelbase sedan developed for China; Coupe and Cabriolet remain in the 4 Series. Regular petrol and diesel models, plug-in hybrids and the Chinese electric G28 derivative therefore coexist without becoming one universal market range.
G20 Sedan, G21 Touring and long-wheelbase G28 serve different body and market roles. The China-only electric i3 eDrive35L/eDrive40L is a G28 derivative rather than the successor to the earlier global I01 i3, while M3 G80/G81 remains a separate BMW M family. Pre-LCI, 2022-update and later powertrain revisions therefore need dated regional rows.
2018–generation production
3principal body codes
2 851–2 961 mmwheelbase range
RWD / xDrivedriven wheels
48V / PHEVelectrification
2022 / 2024major updates
Sedan: dimensions and packaging
Dimensions can change with body, market and model year, so this page keeps them tied to the exact factory branch.
Length4,709–4,713 mm
Width1,827 mm
Height≈ 1,435 mm
Wheelbase2,851 mm
Luggage≈ 480 L
Fuel tank40–59 L
Seats5
Doors4-door sedan · 5 seats
| Body | Code | Production | Doors / seats | Length | Luggage |
|---|---|---|---|---|---|
| Sedan | G20 | 2018– | 4-door sedan · 5 seats / 5 | 4,709–4,713 mm | ≈ 480 L |
| Touring | G21 | 2019– | 5-door wagon · 5 seats / 5 | 4,709–4,713 mm | 500–1,510 L |
| Long-wheelbase Sedan | G28 | 2019– | 4-door long-wheelbase sedan · 5 seats / 5 | 4,829 mm | ≈ 480 L |
Engines and powertrains
The generation could span very different engines and drivetrains. The table keeps output, gearbox, market and production period together.
Factory modification matrix
Documented sedan applications; output and availability remain market- and model-year-specific.
| Model | Years | Engine | Output | Transmission | Drive | Market | Source |
|---|---|---|---|---|---|---|---|
| 318i / 320i | 2019–present | B48B20 | 156–184 PS | 8AT | RWD / xDrive | Global range | The new BMW 3 Series Sedan and Touring |
| 330i | 2019–present | B48B20 | 245–258 PS | 8AT | RWD / xDrive | Global range | The new BMW 3 Series Sedan and Touring |
| M340i xDrive | 2019–present | B58B30 mild hybrid | 374–387 PS | 8AT | xDrive | Global range | The new BMW 3 Series Sedan and Touring |
| 318d / 320d | 2019–present | B47D20 mild hybrid | 150–190 PS | 6MT / 8AT | RWD / xDrive | Europe | The new BMW 3 Series Sedan and Touring |
| 330d / M340d xDrive | 2019–present | B57D30 mild hybrid | 286–340 PS | 8AT | RWD / xDrive | Europe | The new BMW 3 Series Sedan and Touring |
| 320e / 330e | 2020–present | B48B20 + electric motor | 204–292 PS system | 8AT hybrid | RWD / xDrive | Global range | The new BMW 3 Series Sedan and Touring |
Diesels
B47 and B57 combine DPF, EGR, SCR and, on selected versions, a 48-volt starter-generator. Diagnostics include pressure, temperature and regeneration history.
Plug-in hybrids
320e/330e combine B48, a transmission-integrated motor and a high-voltage battery. Capacity, electric range and charging hardware changed substantially in 2024.
Electric G28
China-market i3 eDrive35L/eDrive40L use the G28 body basis but are separate electric derivatives with different structures and service requirements.
How power reaches the road
Gearboxes, driven wheels and final-drive hardware changed with engine, market and production date.
Rear-wheel drive
The base longitudinal layout retains classic balance; exact final drive and half-shafts follow the powertrain.
xDrive
Electronically controlled all-wheel drive is available widely. Tyre size, model and wear should be matched across axles.
Eight-speed Steptronic
The automatic is effectively universal; hybrid variants integrate the electric motor and require their own service and safety procedure.
What changed underneath
Suspension, brakes, safety systems and electronics evolved across the range, even when cars shared the same basic architecture.
Body and chassis
- CLAR architecture and increased body rigidity
- Front struts and five-link rear suspension
- Passive, M Sport or adaptive chassis depending on derivative
Digital architecture
- Early iDrive 7 with separate displays
- BMW Curved Display and newer OS versions after LCI
- Remote upgrades only where market and option specification support them
Body differences
- G21 separately opening rear glass
- G28 wheelbase 110 mm longer than G20
- PHEV-specific luggage and high-voltage packaging
How the generation evolved
The important launches, additions and updates did not always happen at the same time for every body or market.
G20
Sedan is revealed in autumn 2018 and global market launch begins in March 2019.
G21 and G28
Touring production begins in June while BMW Brilliance launches the long-wheelbase China-market sedan.
Electrification
The 48-volt petrol/diesel range and 320e/330e PHEVs expand, including Touring derivatives.
LCI
Exterior and cabin are revised with BMW Curved Display and a newer digital interface architecture.
Technical update
Chassis, interfaces and plug-in hybrids are revised with a new battery and longer electric range.
The versions that stood apart
Performance models, option packages and regional editions may look related, but their engineering and production identity can be very different.
G28 Li
G28BMW Brilliance China-market long-wheelbase sedan with its own range, cabin and update path.
320e / 330e
G20/G21PHEV derivatives with build-date-specific luggage, mass, battery and charging figures.
BMW i3 Sedan
G28 BEVElectric China-market derivative of the long-wheelbase body; unrelated to the earlier I01 BMW i3 hatchback.
Inside the car
Cabin technology and standard equipment changed by country and year; a build sheet remains the best guide to one individual car.
Interface
- iDrive 7 on early cars
- Curved Display and BMW Operating System 8/8.5 by date and market
- Apple CarPlay/Android Auto and remote services depend on region and subscriptions
Assistance
- Driving Assistant and Driving Assistant Professional
- Parking Assistant, surround cameras and reversing functions
- Actual capability follows installed hardware and option codes
Chassis and comfort
- Standard, M Sport and adaptive suspension
- Laser/adaptive LED where offered by phase and market
- G28-specific rear-seat-oriented options
What to check today
A practical starting point for inspecting and maintaining a car from this generation — not a diagnosis of an individual example.
Electronics
- Full fault scan and open service-campaign check
- 12-volt and, where fitted, 48-volt battery condition
- Camera, radar, iDrive and remote-service operation
Powertrain
- Leaks and integrity of separate cooling circuits
- Smooth B48/B58/B47/B57 operation against service history
- PHEV battery, charge port and thermal-management report
Chassis and xDrive
- Even wear and matching tyre specification
- Arm play, mounts and adaptive-damper condition
- No transmission vibration or shudder
| Item | Interval / trigger | Catalog note |
|---|---|---|
| Engine oil and filter | CBS-based and duty-cycle adjusted | Approval depends on engine, region and GPF/DPF fitment. |
| Brake fluid | every 2 years | PHEV regeneration does not replace disc inspection and free caliper movement. |
| Software and campaigns | check at each scheduled visit | Apply updates only when VIN-compatible and with stable power support. |
| PHEV system | CBS and exact-battery manual | Inspect charging, isolation, cooling and high-voltage health report. |
How to identify the exact car
The badge and registration year tell only part of the story; production date, body code, engine and factory options complete it.
- Body code
- G20 is the standard sedan, G21 Touring and G28 long-wheelbase sedan; G28 i3 must be separately marked as BEV.
- Build date
- Separates pre-LCI, the 2022 LCI and the 2024 technical update.
- Option codes
- Resolve actual assistance, display, lighting, suspension and connectivity functions.
- Market
- Powertrains, emissions hardware, telematics and online-service availability vary regionally.
Where the information comes from
The story is mapped through English Wikipedia and its bibliography, then important dates and technical claims are checked against BMW material.
- 01BMW 3 Series (G20)Wikipedia contributors
English-language secondary overview of the generation, body programme, powertrains and production chronology; key claims are cross-checked against the factory sources below.
- 02The new BMW 3 Series Sedan and TouringBMW Group Classic / BMW Group
Official body history, production dates and position within the model range.
- 03Long-wheelbase BMW 3 Series Sedan for ChinaBMW Group Classic / BMW Group
Official body history, production dates and position within the model range.
- 0450 years of the BMW 3 SeriesBMW Group Classic / BMW Group
Official body history, production dates and position within the model range.
Notes and limitations
- Current-production status and range context were checked against BMW material on the 6 August 2026 editorial date.
- Some My BMW and ConnectedDrive functions may be unavailable after a car is imported to another region.
4 primary references · market differences documentedPhotography: Alexander Migl, CC BY-SA 4.0 · Wikimedia Commons. Rights checked 2026-08-06; local 640 px and 1,280 px avif versions created; the complete source frame is retained without cropping.Updated 6 August 2026