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N47D20
2.0L Diesel
N-series • N47 family • 2007–2014
35%
Engine Reliability
The N47 is BMW's most notorious diesel engine. Its rear-mounted timing chain is the single biggest concern – it can wear prematurely and snap, destroying the engine. The design makes replacement extremely labour-intensive. Despite this critical flaw, the engine offers good performance and fuel economy when maintained.
2.0L
Displacement
I4
Layout
143–177 hp
Power
300–350 Nm
Torque
Diesel
Fuel
Turbocharged
Aspiration
Technology & Features
Fuel SystemCommon-rail direct injection
ValvetrainDOHC 16-valve
Used In 3 Applications
3
Known Issues
1
Critical
2
Wear Items
3
Applications
Known Issues – N47D20
critical
Timing Chain Failure (Rear-Mounted) Very Common (>50%)
The N47 is notorious for its rear-mounted timing chain that wears prematurely and can snap, destroying the engine. This is the single biggest concern with this engine. Can fail as early as 50k km.
Typical Mileage
50,000–120,000 km
Est. Repair Cost
€2,000–€5,000 (engine replacement if chain snaps)
DIY Friendly
✗ Specialist
Rattling from rear of engineChain slap noise on cold startCatastrophic engine failure
high
Swirl Flap Failure Common (>30%)
Intake swirl flaps can break apart and get ingested by the engine, causing catastrophic damage. Preventative delete kits are strongly recommended.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€400–€800 (delete kit) or €2,000+ (engine damage)
DIY Friendly
✓ Yes
Loss of powerMetal debris in intakeRough running
medium
EGR Valve Clogging Common (>35%)
EGR valve clogs with carbon deposits, causing poor performance and increased emissions. Especially problematic with frequent short trips.
Typical Mileage
60,000–100,000 km
Est. Repair Cost
€300–€600
DIY Friendly
✓ Yes
Reduced powerBlack smokeEML lightRough idle
Wear & Maintenance – N47D20
DPF (Diesel Particulate Filter)
120,000–200,000 km
Replacement Cost€800–€2,000
Wear Factor45%
Dual Mass Flywheel
100,000–180,000 km
Replacement Cost€600–€1,200
Wear Factor55%
Applications (3)
1 Series E87 / E82 / E88
E872004–2013
Variants118d, 120d
Power143–177 hp
Torque300–350 Nm
BodyHatchback, Coupe, Convertible
Reliability68%
Car-Specific Issues (E87)
mediumRear Subframe Mounting Points
lowWindow Regulator Failure
mediumFront Control Arm Bushings
3 Series E90 / E91 / E92 / E93
E902005–2013
Variants318d, 320d
Power143–177 hp
Torque300–350 Nm
BodySedan, Touring, Coupe, Convertible
Reliability65%
Car-Specific Issues (E90)
highElectric Steering Rack Failure
highFootwell Module Water Damage
X3 F25
F252010–2017
VariantsX3 18d, X3 20d
Power143–184 hp
Torque300–380 Nm
BodySAV
Reliability70%
Car-Specific Issues (F25)
mediumxDrive Transfer Case Leak
Transmissions (3)
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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
Replacement Cost€700–€1,500
Wear Factor55%
Dual Mass Flywheel
150,000–250,000 km
Replacement Cost€500–€1,000
Wear Factor45%
Transmission Fluid
Every 80,000 km
Replacement Cost€50–€120
Wear Factor30%
Fluid TypeMTF-LT-4 / MTF-LT-5
Service IntervalLifetime fill (recommended every 80,000 km)
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6-Speed Automatic (ZF 6HP)
ZF • 6-speed automatic • 2003–2014
The ZF 6-speed is an excellent torque-converter automatic used across BMW, Audi, Jaguar, and others. Smooth, responsive, and very reliable when serviced properly. The 6HP26 handles up to 600Nm. Mechatronic (valve body) issues can occur at high mileage if fluid has never been changed.
Known Issues2
high
Mechatronic Unit Failure Moderate (~20%)
The mechatronic unit (integrated valve body and TCU) can fail, causing erratic shifting, limp mode, or complete transmission failure. Usually caused by degraded fluid.
Typical Mileage
120,000–200,000 km
Est. Repair Cost
€800–€2,500
DIY Friendly
✗ Specialist
Harsh shiftingLimp mode (stuck in gear)Warning lightNo drive
medium
Torque Converter Shudder Moderate (~20%)
Torque converter lockup clutch develops a shudder at light throttle / highway cruising.
Typical Mileage
100,000–180,000 km
Est. Repair Cost
€1,000–€2,000
DIY Friendly
✗ Specialist
Vibration at 60-100 km/hShudder under light load
Wear Items
Transmission Fluid & Filter
Every 60,000–80,000 km
Replacement Cost€250–€500
Wear Factor50%
Transmission Pan Gasket
With fluid service
Replacement Cost€30–€60
Wear Factor40%
Fluid TypeZF Lifeguard 6
Service IntervalEvery 60,000–80,000 km (BMW claims lifetime)
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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
Replacement Cost€300–€600
Wear Factor40%
Fluid TypeZF Lifeguard 8
Service IntervalEvery 80,000–100,000 km