The BMW M8 is a masterpiece of engineering — the ultimate blend of luxury, precision, and power. With its aggressive design and twin-turbo V8 heart, the M8 is more than a car; it’s a statement of performance and prestige. But even the most powerful engines eventually wear down. Whether due to overheating, oil starvation, or high mileage, an engine replacement can become necessary.
If your BMW M8’s engine has failed or started showing signs of serious trouble, buying a used or rebuilt BMW M8 engine is often the smartest solution. It offers OEM quality at a fraction of the price of a brand-new unit — without sacrificing reliability or performance.
In this guide, we’ll explore everything you need to know about used BMW M8 engines — from specifications and sourcing to installation, warranty, and long-term care.
The Power Behind the BMW M8
The BMW M8 uses the S63B44T4 engine, a 4.4-liter twin-turbocharged V8 masterpiece derived from the legendary M5.
This engine is the soul of the car, delivering incredible acceleration and smoothness in all driving conditions.
Key specifications:
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Engine code: S63B44T4
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Displacement: 4.4 liters (4395 cc)
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Configuration: V8, twin-turbocharged, DOHC, 32 valves
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Fuel system: Direct fuel injection
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Compression ratio: 10.0 : 1
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Power output: 600 – 617 horsepower
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Torque: 553 lb-ft (750 Nm)
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Applications:
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BMW M8 Coupe (F92)
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BMW M8 Convertible (F91)
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BMW M8 Gran Coupe (F93)
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The S63 engine combines precision German engineering with relentless torque delivery. However, due to its high-performance nature, it demands exceptional maintenance — and even small issues can lead to expensive damage.
Why Choose a Used BMW M8 Engine?
Replacing a BMW M8 engine through a dealership can cost well over $30,000 – $40,000, depending on region and configuration. A quality used or rebuilt engine, on the other hand, can cost 40–60% less, while still offering comparable reliability.
Top benefits of buying a used or rebuilt M8 engine
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Huge Cost Savings – You can save thousands of dollars versus a new OEM unit.
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OEM Original Quality – Used engines are genuine BMW units, often sourced from low-mileage donor vehicles.
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Quick Availability – No months-long factory back-order delays.
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Eco-Friendly – Reusing existing components reduces waste and environmental impact.
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Tested & Certified – Reliable suppliers compression-test and inspect engines before shipping.
When purchased from a trusted source, a used BMW M8 engine can deliver years of service and performance nearly identical to new.
Types of Used BMW M8 Engines Available
At USA Auto Parts LLC and other reputable suppliers, you’ll typically find three main options when looking for a replacement M8 engine.
1. Low-Mileage Used Engines
These are OEM engines removed from donor vehicles, often due to body damage or insurance write-offs.
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Usually under 50,000 miles
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Factory-original condition
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Fully tested for compression, oil pressure, and performance
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Ideal for direct replacement
2. Rebuilt Engines
Rebuilt engines are used cores that have been disassembled, cleaned, inspected, and rebuilt with new OEM or equivalent components.
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Worn parts replaced (bearings, seals, gaskets, pistons as needed)
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Dyno-tested and quality-controlled
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Often backed by extended warranty (up to 5 years)
3. Remanufactured Engines
A remanufactured engine is rebuilt to factory-new standards, using advanced machining and new components throughout.
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Zero-mile rebuilds
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Meets or exceeds OEM tolerances
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Premium choice for long-term ownership
Each type has its advantages depending on your budget, time frame, and performance expectations.
Understanding Compatibility & Fitment
The BMW M8 shares its engine platform with the BMW M5 (F90), meaning certain components and configurations may overlap.
However, when ordering a replacement engine, compatibility is critical.
Before buying, always confirm:
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Vehicle VIN number
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Production year (2019–2024)
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Drivetrain type (xDrive or RWD)
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ECU/Software version
At USA Auto Parts LLC, compatibility specialists verify all part numbers and fitment details before shipping to ensure seamless installation.
Common Causes of M8 Engine Failure
Knowing what went wrong with your current engine helps ensure your replacement lasts longer.
Typical reasons for BMW M8 engine failure include:
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Oil Starvation: Aggressive driving without proper oil level checks can cause bearing wear.
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Turbocharger Failure: High boost pressures and heat lead to turbo oil seal damage.
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Overheating: Coolant leaks or failed thermostats can warp cylinder heads.
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Improper Tuning: Unverified aftermarket tunes often push the S63 beyond safe limits.
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Fuel Contamination: Low-quality fuel or injector failure can cause detonation.
Buying a used or rebuilt engine gives you a chance to start fresh — with proper maintenance and cooling upgrades to prevent repeat issues.
What to Expect from a Quality Used BMW M8 Engine
When you buy from a reputable supplier, your replacement engine should come with full transparency. Expect:
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Verified mileage documentation
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Complete compression test results
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Leak-down and oil-pressure test reports
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Cleaned, painted exterior surfaces
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All sensors and turbos (if included)
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Updated service records if available
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Warranty documentation
This ensures you’re not just getting a used engine — you’re getting a proven, ready-to-install powertrain.
Warranty & Shipping Information
At USA Auto Parts LLC, every used BMW M8 engine includes:
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Up to 5 Years Unlimited-Mileage Warranty (varies by type)
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Free Shipping within the U.S.
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Optional International Delivery (customs fees apply)
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No Core Charge — keep your old engine
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Pre-installation guidance and VIN verification
Before shipping, all engines undergo final inspection, including compression, leak, and visual testing. Packaging follows secure freight standards to prevent damage during transit.
Installation Tips for a Smooth Swap
Installing a high-performance engine like the S63B44T4 demands professional skill and precision.
Here’s how to make your replacement project a success:
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Hire a BMW-Certified Mechanic – The M8’s tight tolerances and electronics require expertise.
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Flush Cooling & Oil Systems – Remove contaminants from the old engine.
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Replace Ancillaries – Always replace gaskets, seals, water pump, and belts.
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Update ECU Software – The ECU may need reprogramming to match the new engine.
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Break-In Period – Avoid redline operation for the first 500–1,000 miles to allow parts to seat.
Proper installation ensures your new engine delivers factory-level performance from day one.
Maintenance Tips for Longevity
Once installed, protecting your new or rebuilt BMW M8 engine is all about consistent care.
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Change oil every 5,000 miles using BMW-approved 0W-30 synthetic.
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Inspect turbo hoses and coolant lines regularly for leaks.
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Use high-octane fuel (minimum 93 octane) to prevent knocking.
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Warm up before heavy acceleration.
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Avoid aftermarket tunes unless from a proven tuner with S63 experience.
A well-maintained S63 can easily exceed 150,000 miles — even under spirited driving.
Why Buy from USA Auto Parts LLC?
USA Auto Parts LLC is a trusted American supplier of used and rebuilt powertrain components for luxury and performance vehicles.
What sets us apart:
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Nationwide network of salvage partners and rebuilders
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100% OEM used parts, tested and verified
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Dedicated technical support for VIN verification and fitment
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Fast, insured shipping anywhere in the U.S. and internationally
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Transparent warranties and no hidden charges
Our goal is to provide customers with affordable, reliable alternatives to dealership-priced parts — without compromising quality or performance.
Real-World Example: M8 Engine Replacement Case
A customer from Texas recently contacted us after his 2020 BMW M8 Coupe suffered a spun bearing at 62,000 miles.
BMW quoted him $37,000 for a full replacement.
Through USA Auto Parts LLC, he purchased a tested used S63B44T4 engine with 28,000 miles for $16,900, including a 3-year warranty and free freight shipping.
The installation was completed by a certified BMW technician, and the vehicle returned to factory performance — saving him more than $20,000.
Stories like this are why more M8 owners are turning to high-quality used engines instead of overpaying for new ones.
How to Order Your Used BMW M8 Engine
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Contact USA Auto Parts LLC by phone or email.
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Provide your VIN and vehicle details.
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Receive an exact-match quote with shipping timeline.
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Approve order and confirm payment.
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Engine is tested, packaged, and shipped directly to your installer.
📞 Phone: (630) 999-2048
📧 Email: billing@usaautopartsllc.com
🌐 Website: www.usaautopartsllc.com
Conclusion – Power Restored, Value Preserved
A failing BMW M8 engine doesn’t have to spell the end of your car’s life — or your wallet. With a carefully sourced used or rebuilt S63 engine, you can restore your car’s exhilarating performance at a fraction of the cost.
Choosing a reputable supplier like USA Auto Parts LLC ensures you get a verified engine, clear warranty, and technical guidance from start to finish.
So if you’re facing engine trouble in your M8, take the smarter route.
Revive your car’s legendary performance — and enjoy the thrill of that twin-turbo V8 roar once again.
