Owner's Guide
BMW 4 SERIES
From the First F-Chassis to the Fully Electric i4
The BMW 4-Series was created to separate BMW’s sportier coupes and convertibles from the traditional 3-Series sedan. While it shares DNA with the 3-Series, the 4-Series leans harder into design, performance, and technology—and later becomes the gateway into BMW’s electrification strategy.
If you’ve ever wondered:
- “Is my 4-Series basically a 3-Series?”
- “What engine do I actually have?”
- “Where does the i4 fit in?”
This guide answers that.
F32 / F33 / F36 – The First 4-Series (2014–2020)
Production Years: 2014–2020
Body Styles:
- F32 – Coupe
- F33 – Convertible
- F36 – Gran Coupe (4-door fastback)
Common Models: 428i, 430i, 435i, 440i, M4
Engines & Horsepower
- N20 / B48 (Turbo I4): ~240–255 hp
- N55 (Turbo I6): ~300 hp
- B58 (Turbo I6): ~320–335 hp
- S55 (M4): ~425–444 hp (Competition models higher)
Why BMW Built It
- Lower, wider, more aggressive than the 3-Series
- Frameless doors and sport-focused suspension tuning
- Same engineering foundation, sharper personality
Common Ownership Considerations
- Timing chain concerns on early N20 engines
- Cooling and oil filter housing leaks
- Convertible top maintenance on F33 models
Who it’s for
Drivers who want sportiness and style without going full M-car.
G22 / G23 / G26 – Second Generation & Major Tech Leap (2021–Present) ICE- Internal Combustion Engine.
Production Years: 2021–Present
Body Styles:
- G22 – Coupe
- G23 – Convertible
- G26 – Gran Coupe
Common Models: 430i, M440i, M4
Engines & Horsepower
- B48 (Turbo I4): ~255 hp
- B58 (Turbo I6): ~382 hp (M440i)
- S58 (M4): ~473–503 hp+
What Changed
- All-new chassis rigidity
- Advanced driver assistance systems
- Mild-hybrid technology introduced on some engines (48-volt assist)
What to Watch For
- Increased electronic complexity
- Calibration-sensitive driver assistance systems
- Maintenance intervals are more critical than ever
G26 i4 – The Full Electric Shift (2022–Present)
The BMW i4 represents a major turning point:
This is where the 4-Series platform transitions from internal combustion → electrification → full EV, without abandoning BMW’s driving character.
Production Years: 2022–Present
Body Style: Gran Coupe (EV-only)
Electric Powertrains & Output
- i4 eDrive40: ~335 hp
- i4 M50 (Dual Motor AWD): ~536 hp
What Makes the i4 Different
- Fully electric drivetrain
- Instant torque delivery
- Lower center of gravity due to battery placement
- Regenerative braking replaces traditional engine braking feel
Ownership Considerations
- Battery thermal management is critical
- Software updates play a larger role than ever
- Suspension and tire wear still matter — it’s still a BMW
Who it’s for
Drivers who want performance, luxury, and daily usability — without fuel.
Hybrid vs Full Electric — Quick Clarity
Many owners hear “hybrid” and “electric” used interchangeably. They are not the same.
- Mild Hybrid (48V):
Assists the engine, improves efficiency, still gasoline-powered - Plug-In Hybrid (not common in 4-Series):
Gas + electric motors - Full Electric (i4):
No engine, no fuel, fully battery-powered
This distinction matters for maintenance, diagnostics, and ownership expectations.
Why This Matters at Bimmer PhD
When someone says “I have a 4-Series”, that could mean:
- A turbocharged inline-4 coupe
- A B58 inline-6 mild hybrid
- Or a 536-horsepower fully electric i4 M50
Each one requires completely different knowledge, tooling, and service strategy.
That’s why guides like this exist on BimmerPhD.com — to educate first, service second.