BMW Buyer's Guide

Comprehensive Used Car Analysis
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N55B30 3.0L Turbo Petrol
N55B30 3.0L Turbo Petrol
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N55B30

3.0L Turbo Petrol
N-series • N55 family • 2009–2018
68%
Engine Reliability
The N55 replaced the twin-turbo N54 with a more reliable single twin-scroll turbo design. It eliminated most of the N54's major issues (HPFP, injectors, wastegate) while retaining the 306hp output. Still susceptible to oil leaks and charge pipe failures, but overall a solid and responsive powerplant.
3.0L
Displacement
I6
Layout
326–340 hp
Power
450–500 Nm
Torque
Petrol
Fuel
Turbocharged
Aspiration
Technology & Features
TwinPower Turbo (twin-scroll single turbo)Valvetronic IIIDirect injectionDouble-VANOSElectric water pump
Fuel SystemDirect injection
ValvetrainDOHC 24-valve, Valvetronic III, Double-VANOS
Used In 6 Applications
1 Series F20 / F21 M135i, M140i 3 Series F30 / F31 / F34 335i 5 Series F10 / F11 535i 7 Series F01 / F02 740i X5 E70 X5 35i X5 F15 X5 35i
4
Known Issues
0
Critical
2
Wear Items
6
Applications

Known Issues – N55B30

medium Charge Pipe Blow-Off Common (>35%)
Factory plastic charge pipe blows off under high boost, particularly in warm weather or spirited driving. Aftermarket aluminium replacement recommended.
Typical Mileage
40,000–80,000 km
Est. Repair Cost
€100–€250
DIY Friendly
✓ Yes
Sudden power lossBoost leak whistleLimp mode
high Valve Cover / VANOS Gasket Leak Common (>35%)
Valve cover and VANOS solenoid gaskets seep oil over time. Oil can drip onto hot exhaust components causing burning smell and smoke.
Typical Mileage
60,000–120,000 km
Est. Repair Cost
€300–€700
DIY Friendly
✓ Yes
Burning oil smellVisible oil seepageSmoke from engine
high Oil Filter Housing Gasket Leak Common (>35%)
Oil filter housing gasket deteriorates and leaks oil onto belts and other components.
Typical Mileage
60,000–100,000 km
Est. Repair Cost
€250–€400
DIY Friendly
✓ Yes
Oil leakBurning smellOil on engine
high Electric Water Pump Failure Common (~30%)
Electric water pump fails causing overheating. Shared issue with other N-series inline-6 engines.
Typical Mileage
80,000–130,000 km
Est. Repair Cost
€400–€700
DIY Friendly
✓ Yes
OverheatingWarning lightNo heat from vents

Wear & Maintenance – N55B30

Spark Plugs Every 45,000 km
NewReplace
Replacement Cost€100–€180
Wear Factor60%
Ignition Coils 80,000–120,000 km
NewReplace
Replacement Cost€200–€400
Wear Factor50%

Applications (6)

1 Series F20 / F21

F20
2011–2019
VariantsM135i, M140i
Power326–340 hp
Torque450–500 Nm
BodyHatchback
Reliability74%
Car-Specific Issues (F20)
mediumTailgate Wiring Harness Failure
lowDriveshaft Vibration

3 Series F30 / F31 / F34

F30
2012–2019
Variants335i
Power306 hp
Torque400 Nm
BodySedan, Touring, Gran Turismo
Reliability72%
Car-Specific Issues (F30)
mediumBattery Discharge Issues
lowDoor Lock Actuator Failure

5 Series F10 / F11

F10
2010–2017
Variants535i
Power306 hp
Torque400 Nm
BodySedan, Touring
Reliability67%
Car-Specific Issues (F10)
highAir Suspension Issues (if equipped)
mediumSteering Rack Issues

7 Series F01 / F02

F01
2008–2015
Variants740i
Power320 hp
Torque450 Nm
BodySedan
Reliability50%
📝 Post-LCI (2012–2015).
Car-Specific Issues (F01)
highAir Suspension Failure
mediumComfort Access & Keyless Entry Faults
mediumSoft-Close Door Mechanism Failure

X5 E70

E70
2006–2013
VariantsX5 35i
Power306 hp
Torque400 Nm
BodySAV
Reliability60%
📝 Post-LCI (2010–2013).
Car-Specific Issues (E70)
highTransfer Case Failure
highAir Suspension Problems

X5 F15

F15
2013–2018
VariantsX5 35i
Power306 hp
Torque400 Nm
BodySAV
Reliability68%
Car-Specific Issues (F15)
highAir Suspension Compressor Failure

Transmissions (2)

6-Speed Manual (Getrag)
6-Speed Manual (Getrag)
6-Speed Manual (Getrag)
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6-Speed Manual (Getrag)

Getrag • 6-speed manual • 2003–2019

Getrag 6-speed manual used across a wide range of BMWs. Different models handle various torque capacities. Known for precise, mechanical shift action. The GS6-53DZ handles up to 500Nm (used with 335i/M135i).
Known Issues2
medium 2nd Gear Synchro Wear Moderate (~20%)
Second gear synchros can wear, especially on higher-torque applications, causing grinding on fast 2nd gear shifts.
Typical Mileage
100,000–180,000 km
Est. Repair Cost
€800–€1,500
DIY Friendly
✗ Specialist
Grinding into 2nd gearDifficulty downshifting to 2nd
low Clutch Release Bearing Noise Moderate (~25%)
Clutch release (throw-out) bearing develops a chirp or whine when clutch is depressed.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€400–€800 (usually replaced with clutch)
DIY Friendly
✗ Specialist
Chirping with clutch pressedWhining noiseVibration in pedal
Wear Items
Clutch Assembly 100,000–180,000 km
NewReplace
Replacement Cost€700–€1,500
Wear Factor55%
Dual Mass Flywheel 150,000–250,000 km
NewReplace
Replacement Cost€500–€1,000
Wear Factor45%
Transmission Fluid Every 80,000 km
NewReplace
Replacement Cost€50–€120
Wear Factor30%
Fluid TypeMTF-LT-4 / MTF-LT-5
Service IntervalLifetime fill (recommended every 80,000 km)
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