The F90 M5's S63 twin-turbo V8 is a performance powerhouse but carries serious rod bearing and cooling system risks that can lead to catastrophic engine failure if ignored. This generation is still relatively new, so high-mileage horror stories are just starting to emerge, but patterns from the F10 generation suggest expensive issues ahead.
Rod Bearing Failure (S63TU4 Engine)
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: metallic knocking at idle or under load, metal shavings in oil during analysis, sudden oil pressure drop, catastrophic engine seizure if ignored
Fix: Preventive bearing replacement requires engine-out, full disassembly, and precision clearance work—about 25-30 hours labor. If the crank is scored, add machine work or crankshaft replacement. Catastrophic failure means short block or complete rebuild.
Estimated cost: $8,000-15,000 preventive; $25,000-40,000 after failure
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: transmission fluid seepage around cooler lines, burnt fluid smell, transmission overheating warning, fluid spots under car near transmission tunnel
Fix: Replace cooler lines and seals, sometimes requires subframe drop for access—8-12 hours labor depending on line location. Flush transmission fluid and verify no internal damage from overheating.
Estimated cost: $1,800-3,200
Transmission Mount Failure (ZF 8HP)
Common · low severity
Typical onset: 50,000-90,000 mi
Symptoms: clunk on aggressive shifts or hard acceleration, vibration through center console at idle, drivetrain slop during throttle tip-in, visible cracking or tearing in rubber mount
Fix: Replace transmission mount and inspect neighboring engine mounts while underneath—3-5 hours labor. Aggressive driving and launch control abuse accelerate wear.
Estimated cost: $800-1,400
High-Pressure Fuel Pump Failure
Occasional · high severity
Typical onset: 30,000-70,000 mi
Symptoms: long crank before starting, rough idle and misfires under load, limp mode with fuel system fault codes, metal contamination in fuel system if pump grenades
Fix: Replace high-pressure fuel pump, filter, and inspect injectors for debris—6-9 hours labor. If pump fails catastrophically, injectors and fuel rails may need replacement due to metal contamination.
Estimated cost: $2,500-4,500; up to $8,000 with injector replacement
Turbocharger Wastegate Rattle
Occasional · medium severity
Typical onset: 50,000-100,000 mi
Symptoms: rattling noise on cold start that fades when warm, loss of boost pressure, turbo underboost codes, exhaust smoke under hard acceleration
Fix: Replace affected turbocharger(s)—wastegate bushings wear and cannot be serviced separately. Each turbo requires 8-12 hours labor due to tight engine bay packaging. Both turbos often replaced together.
Estimated cost: $4,000-6,500 per turbo; $8,000-12,000 for both
Coolant System Leaks (Turbo Coolant Lines)
Occasional · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: coolant smell from engine bay, low coolant warning, visible seepage near turbos or valley, overheating under sustained load
Fix: Replace turbo coolant feed and return lines, often requires partial engine disassembly for access—10-14 hours labor. Pressure-test entire system and replace expansion tank if brittle.
Estimated cost: $2,200-3,800
Owner tips
Run Blackstone or equivalent oil analysis every 5,000 miles starting at 50k to catch bearing wear early—cheapest insurance for the S63 engine
Use only BMW LL-01FE oil spec, change every 5,000-7,000 miles despite 10k OCI—these engines are hard on oil
Avoid sustained launch control use; it accelerates transmission mount and drivetrain component wear significantly
Budget $2,000-3,000 annually for maintenance starting around 50k miles—this is not a cheap car to own out of warranty
Buy only with comprehensive records, recent oil analysis showing clean bearings, and a serious maintenance fund—this is a $20k+ grenade if the engine lets go.
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.
Fitment notes: AGM battery required; located in trunk; do not substitute with standard lead acid
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Control Modules — 2022 BMW M5
Every control module on the 2022-2023 BMW M5 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ ConnectedDrive services; SIM card and subscription activation required
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2022 BMW M5 4.4L Twin-Turbo V8 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.