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N63B44TU
4.4L Twin-Turbo V8 Petrol (TU)
N-series • N63 family • 2012–2018
45%
Engine Reliability
The TU (Technical Update) revision of the N63 added Valvetronic and addressed many of the original's worst issues. While improved over the first-generation N63, it didn't fully eliminate the hot-V heat-related problems. Expect gasket work, but the frequency and severity are reduced compared to the original N63.
4.4L
Displacement
V8
Layout
450 hp
Power
650 Nm
Torque
Petrol
Fuel
Twin-turbocharged
Aspiration
Technology & Features
Fuel SystemDirect injection
ValvetrainDOHC 32-valve, Valvetronic, Double-VANOS
Used In 2 Applications
1
Known Issues
0
Critical
1
Wear Items
2
Applications
Known Issues – N63B44TU
high
Oil & Coolant Leaks (Improved over original N63) Common (~30%)
The TU revision improved but didn't eliminate the hot-V leak issues. Expect gasket work at higher mileages.
Typical Mileage
80,000–140,000 km
Est. Repair Cost
€1,500–€3,500
DIY Friendly
✗ Specialist
Oil consumptionBurning smellCoolant loss
Wear & Maintenance – N63B44TU
Spark Plugs & Ignition Coils
Every 50,000 km
Replacement Cost€400–€700
Wear Factor55%
Applications (2)
X5 F15
F152013–2018
VariantsX5 50i
Power450 hp
Torque650 Nm
BodySAV
Reliability68%
Car-Specific Issues (F15)
highAir Suspension Compressor Failure
X5 G05
G052018–2025
VariantsX5 50i
Power462 hp
Torque650 Nm
BodySAV
Reliability74%
📝 Pre-LCI. V8 twin-turbo with hot-V layout; improved over original N63 but still requires attentive maintenance.
Car-Specific Issues (G05)
highAir Suspension Compressor Failure
medium12V Battery Drain
Transmissions (1)
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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