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M5 F90 M5
F90 • 2017–2023 • Sedan
1
Engine Options
7
Known Issues
1
Critical Issues
55%
Reliability Score
Facelift (LCI) – 2020
- Competition standard (625 hp)
- CS limited edition with 635 hp
- Updated iDrive 7
- Revised front design
55% – Below Average
Engines
S63B44 – 4.4L Twin-Turbo V8 M Petrol
M5, M5 Competition, M5 CS • 600–635 hp • 750 Nm
Displacement 4.4L
Layout V8
Fuel Petrol
Transmission 8-Speed Automatic (ZF 8HP)
Known Issues4 issues
high
Oil Leaks (Hot-V Related) Common (>35%)
The hot-V layout causes extreme heat on oil lines, valve cover gaskets, and turbo seals, leading to oil leaks.
Typical Mileage
60,000–120,000 km
Est. Repair Cost
€1,500–€4,000
DIY Friendly
✗ Specialist
Burning oil smellSmoke from engine bayOil consumptionOil drips
high
Coolant Leaks Common (~30%)
Coolant pipe and hose seals degrade from heat, causing coolant loss. The coolant pipes running through the V are particularly prone.
Typical Mileage
60,000–120,000 km
Est. Repair Cost
€800–€2,000
DIY Friendly
✗ Specialist
Coolant lossOverheating warningSweet smell
critical
Rod Bearing Wear Moderate (~20%)
Rod bearings can wear, although less frequently than S65/S85. Oil analysis recommended every 10,000 km.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€3,000–€6,000
DIY Friendly
✗ Specialist
Knocking noiseMetal in oil analysisLow oil pressure
high
Injector Failure Moderate (~25%)
Direct fuel injectors fail due to heat stress, causing misfires.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€1,000–€2,500
DIY Friendly
✗ Specialist
MisfiresRough runningCheck engine light
Common Issues (F90-specific)
Engine 1
medium
Oil Leaks (Improved but present) Moderate (~25%)
Hot-V oil leak issues are improved in the TU2 revision but not eliminated.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€1,000–€3,000
Category
Engine
Oil smellOil consumptionMinor seepage
Drivetrain 1
medium
Transfer Case Wear (xDrive) Moderate (~20%)
The M xDrive transfer case can develop wear, especially with frequent 2WD mode use.
Typical Mileage
80,000–150,000 km
Est. Repair Cost
€800–€2,000
Category
Drivetrain
xDrive warningClunking from center tunnel
Tyres 1
low
Rear Tyre Wear Very Common (>60%)
With 625–635 hp and rear-biased xDrive, rear tyres wear extremely quickly.
Typical Mileage
10,000–20,000 km per set
Est. Repair Cost
€600–€1,200 per pair
Category
Tyres
Rapid rear tyre wearTraction loss
Wear Items
S63B44 – Wear Items
M5, M5 Competition, M5 CS
Spark Plugs & Coils (8)
Every 30,000 km
Replacement Cost€300–€600
Wear Factor65%
Engine Gasket/Seal Service
80,000–120,000 km
Replacement Cost€2,000–€5,000
Wear Factor70%
Differential Fluid (M-Sport Diff)
Every 50,000 km
Replacement Cost€100–€200
Wear Factor40%