BMW M8 G16 — Problems & Common Faults

The most mature S63 generation: revised bearing geometry, Valvetronic. 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 owners correct with aftermarket exhaust systems. The M xDrive system can be switched to pure rear-wheel drive — in dry 2WD mode the car becomes a thoroughbred 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.

• !! Connecting rod bearing wear (mitigated) from 80,000 km

  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
  2,000–15,000 $
  Ad connecting rod bearing S63B44T4Lagerschalen BMW M5 F90Rod Bearing S63T4 F90
• !! Thermostat and expansion tank worn from 40,000 km

  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.
  300–8,000 $
  Ad thermostat S63T4 F90expansion tank BMW M5 F9017137647284
• !! High-pressure fuel pump (HPFP) failure from 120,000 km

  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.
  1,200–3,000 $
  Ad high-pressure fuel pump S63T4HPFP BMW M5 F9013518604229

+ 9 more engine weaknesses + vehicle weaknesses