BMW X5 M
The most mature S63 generation: revised bearing geometry, Valvetronic, 600–635 hp depending on variant. The sound remains S63-typical — no raw AMG aggression, rather a deep V8 growl with turbo whistle as an accent. Sonically restrained from the factory, which many F90 owners correct with aftermarket exhaust systems. The M xDrive system can be switched to pure rear-wheel drive — in dry 2WD mode the F90 becomes a 625 hp drift tool. Electric wastegate actuators are the new weakness of this generation. Oil changes every 8,000 km with quality full synthetic; do not rely on Longlife intervals. The con rod bearing issue is reduced but not eliminated by the revised geometry — oil analysis remains worthwhile.
625 hp SUV — the most powerful thing BMW puts in an X5
F95 Competition with 625 hp and 48V mild hybrid — the facelift is noticeably more comfortably tuned than the original. Brutal motorway acceleration with cultivated comfort. In tight corners 2.4 tonnes of kerb weight remain honestly apparent.
Engine Weaknesses 8
Revised connecting rod design compared to S63TU with 8 additional oil drillings. Despite this, documented failures exist: a workshop case study shows an F90 M5 with connecting rod and crankshaft damage. The F90 sees the problem less often than the F10.
Symptoms: Noticeable knocking from the engine, metal particles in the sump and filter housing, crankshaft damage as a consequence of delayed diagnosis
The high-pressure fuel pump can fail at high mileages or with aggressive use. Fuel pressure drop causes noticeable power loss and can secondarily damage injectors and turbochargers.
Symptoms: Power loss under high load, hard starting, fault code fuel pressure too low (P0087), stumbling at full throttle.
The turbochargers mounted in the V-valley are subjected to extreme radiant heat. Coolant lines and connections can crack through thermal cycling. Allow an adequate cool-down phase after full-load driving.
Symptoms: Coolant loss in the turbo area, coolant smell after driving, steam from the bonnet, reduced boost pressure.
Electric wastegate actuators on both turbo banks can fail — bank 2 more often. BMW has issued a warranty extension to 15 years/150,000 miles. Cost: €800–€3,500.
Symptoms: Engine fault message, power loss, limp mode activation, boost pressure regulation fault code (typically 4506E/4506F), drivetrain warning in instrument cluster
VANOS solenoids can generate fault codes despite the revised design. The S63T4 uses four solenoids — oil deposits are a common cause. Cleaning or replacement usually resolves the issue. The VANOS gear is a secondary cause if solenoid replacement does not help.
Symptoms: MIL activation, limp mode, fluctuating engine output, rough running at certain rev ranges
Same mechanism as on the S63: V-valley heat hardens valve stem seals. Workshop service £3,540–£4,140 with genuine parts (GND Motors). Typically appears from 120,000+ km.
Symptoms: Blue smoke on acceleration after an idle period, measurably increased oil consumption, sooty spark plugs
The S63B44T4 places heavy demands on the ignition system through high boost pressure and temperatures. A single failed coil signals further failures — standard practice is preventive replacement of all 8 coils at once.
Symptoms: Misfires, rough idle, power loss, fault codes P0300–P0308, noticeable vibration under acceleration.
The S63B44T4 generates extreme heat in the V-valley. Thermostat and plastic expansion tank are prone to premature wear at higher mileages. The overheating risk on failure is considerable.
Symptoms: Coolant loss without visible leak, temperature gauge fluctuates or rises too high, coolant level warning, steam from engine bay.
Vehicle Weaknesses 6
BMW recalled approximately 1.2 million vehicles in 2024, including the X5 M F95 (June 2022–August 2024). Faulty Continental components can deactivate ABS and DSC.
The S63TU2 is prone to con rod bearing wear with frequent cold starts and aggressive use. M specialists recommend oil changes every 8,000 km.
The xDrive transfer case on the F95 is maintenance-intensive. Without oil changes every 60,000–80,000 km, metal debris and contamination accumulate.
The optional air suspension on the F95 X5 M can develop leaks. Air springs and compressor wear — especially with the high vehicle weight and extreme temperatures.
The X5 M F95 with 625 hp and SUV weight causes high brake wear. M Performance pads squeal heavily in cold conditions and wear quickly. Retrofit ceramic brakes cost a multiple of standard.
The iDrive 7 system on the F95 shows occasional screen blackouts and connectivity issues like other G-series models. Software updates usually ease the symptoms.