BMW Buyer's Guide

Comprehensive Used Car Analysis
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B58B30 3.0L Turbo Petrol
B58B30 3.0L Turbo Petrol
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B58B30

3.0L Turbo Petrol
B-series • B58 family • 2015–2025
85%
Engine Reliability
The B58 is BMW's current-generation turbocharged straight-six and widely regarded as one of the best engines BMW has ever made. Part of the modular B-series family, it offers exceptional performance, refined power delivery, and excellent reliability. The second generation added port injection for cleaner combustion. A worthy successor to the legendary M54.
3.0L
Displacement
I6
Layout
340 hp
Power
450 Nm
Torque
Petrol
Fuel
Turbocharged
Aspiration
Technology & Features
Modular engine architectureTwinPower Turbo (twin-scroll)Valvetronic IVDirect injection + port injection (gen2)Closed-deck block
Fuel SystemDirect injection
ValvetrainDOHC 24-valve, Valvetronic IV, Double-VANOS
Used In 3 Applications
3 Series G20 / G21 M340i 5 Series G30 / G31 540i X5 G05 X5 40i
1
Known Issues
0
Critical
1
Wear Items
3
Applications

Known Issues – B58B30

medium Valve Cover Leak (Early Production) Occasional (~15%)
Early B58 engines can develop a valve cover gasket leak. Generally well-sorted on later production.
Typical Mileage
60,000–100,000 km
Est. Repair Cost
€300–€500
DIY Friendly
✓ Yes
Oil smellSeepage around valve cover

Wear & Maintenance – B58B30

Spark Plugs Every 60,000 km
NewReplace
Replacement Cost€120–€200
Wear Factor50%

Applications (3)

3 Series G20 / G21

G20
2019–2025
VariantsM340i
Power374 hp
Torque500 Nm
BodySedan, Touring
Reliability78%
Car-Specific Issues (G20)
lowiDrive Software Glitches

5 Series G30 / G31

G30
2017–2023
Variants540i
Power340 hp
Torque450 Nm
BodySedan, Touring
Reliability73%
Car-Specific Issues (G30)
medium48V Mild-Hybrid Starter-Generator Issues
lowDisplay Key Battery Drain

X5 G05

G05
2018–2025
VariantsX5 40i
Power340 hp
Torque450 Nm
BodySAV
Reliability74%
Car-Specific Issues (G05)
highAir Suspension Compressor Failure
medium12V Battery Drain

Transmissions (1)

8-Speed Automatic (ZF 8HP)
8-Speed Automatic (ZF 8HP)
8-Speed Automatic (ZF 8HP)
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8-Speed Automatic (ZF 8HP)

ZF • 8-speed automatic • 2009–present

Widely considered one of the best automatic transmissions ever made. Lightning-fast shifts, excellent efficiency, and remarkable reliability. Used across BMW's entire range from 1 Series to 7 Series. Even better with regular fluid services. The 8HP70/75 handles V8 and V12 torque.
Known Issues1
medium Mechatronic Sleeve Leak (Early Production) Occasional (~10%)
Early production 8HP units can develop a transmission fluid leak from the mechatronic sleeve connector.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€200–€500
DIY Friendly
✗ Specialist
Fluid leakLow fluid warningShifting hesitation
Wear Items
Transmission Fluid & Filter Every 80,000–100,000 km
NewReplace
Replacement Cost€300–€600
Wear Factor40%
Fluid TypeZF Lifeguard 8
Service IntervalEvery 80,000–100,000 km