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2020 BMW M5 F90

4.4L V8 Twin-Turbo S63•AWD•AUTOMATIC•gas•turbo
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5-Year Cost of Ownership
$19,143 maintenance + known platform issues
~$3,829/yr · 320¢/mile equivalent · $9,532 maintenance + $7,011 expected platform issues
Common Problems & Known Issues

The F90 M5's S63Tu engine is a highly-strung twin-turbo V8 that delivers incredible performance but has significant rod bearing wear issues and cooling system vulnerabilities. Many early examples are now seeing catastrophic failures between 60k-100k miles if bearing maintenance was ignored.

Rod Bearing Failure (S63Tu)

Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: metallic knocking on cold start, oil pressure fluctuations, metal shavings in oil analysis, sudden catastrophic engine failure without warning in worst cases
Fix: Preventive service involves dropping the oil pan and replacing all rod bearings with upgraded units—about 12-16 hours labor. Once damage has occurred, you're looking at full engine-out rebuild or short block replacement at 40-60 hours labor. Many shops now recommend proactive bearing replacement at 60k miles on cars driven hard.
Estimated cost: $3,500-6,000 preventive / $25,000-40,000 rebuild

Transmission Oil Cooler Leaks

Occasional · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: transmission fluid spots under car, low trans fluid warnings, occasional slipping or harsh shifts when fluid is low, visible seepage at cooler connections
Fix: The ZF 8HP cooler lines and connections develop seeps, sometimes the cooler itself cracks. Requires lifting car, dropping undertray panels, replacing cooler or lines—4-6 hours labor depending on whether you catch it early or need full cooler replacement.
Estimated cost: $800-1,800

Engine/Transmission Mount Deterioration

Common · medium severity
Typical onset: 40,000-70,000 mi
Symptoms: clunking when shifting from Park to Drive, excessive vibration at idle, drivetrain shudder during hard acceleration, visible tearing or fluid leak from hydraulic mounts
Fix: The hydraulic engine and transmission mounts wear rapidly under hard use. Engine mount is 3-4 hours, transmission mount another 2-3 hours. Most techs recommend doing both simultaneously if one has failed since they wear at similar rates.
Estimated cost: $1,200-2,200 both mounts

Turbocharger Wastegate Rattle

Occasional · low severity
Typical onset: 30,000-60,000 mi
Symptoms: rattling noise at idle or light throttle, brief rattle on cold start, no performance loss initially, can progress to boost control issues if ignored long-term
Fix: The wastegate actuator arms develop play in their bushings, causing characteristic rattle. Some owners live with it; proper fix requires turbo removal and rebuild or replacement—12-16 hours labor per side. Not safety-critical but annoying and can indicate broader turbo wear.
Estimated cost: $3,000-5,000 per turbo

Cooling System Component Failures

Occasional · high severity
Typical onset: 50,000-90,000 mi
Symptoms: coolant warning lights, overheating during spirited driving, visible coolant leaks from water pump or radiator end tanks, steam from engine bay
Fix: The high-performance cooling system has plastic components that fail—water pump, thermostat housings, radiator end tanks. Water pump replacement is 4-6 hours; radiator another 3-5 hours. Track use accelerates these failures. Don't ignore coolant warnings—this engine does not tolerate overheating.
Estimated cost: $1,200-2,500 per component

VANOS Solenoid Issues

Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: rough idle when warm, lack of power in mid-range, fault codes for cam position correlation, occasional limp mode
Fix: Variable valve timing solenoids get clogged or fail electrically. Diagnosis requires ISTA scan tool. Replacement is 2-3 hours per bank, but sometimes just cleaning helps temporarily. Use quality oil and shorter intervals to prevent this.
Estimated cost: $600-1,200
Owner tips
  • Do oil analysis every 5,000 miles to catch bearing wear early—ferrous content above 40ppm is a red flag
  • Consider preventive rod bearing service at 60k miles if the car was tracked or driven hard; it's cheap insurance against $30k engine failure
  • Use only BMW-approved 0W-40 oil and change at 5,000-mile intervals max—this engine is brutal on oil
  • Keep detailed service records showing oil changes, bearing inspections, and cooling system maintenance—resale value depends on it
  • Budget $3,000-5,000/year for maintenance beyond consumables if you plan to keep it past warranty
Exceptional performance machine, but only buy used with documented rod bearing service or budget for it immediately—and expect $5k/year maintenance if driven as intended.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
526 jobs across 17 categories
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.
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