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Engine Finders

BMW 8 Series Specialists

Expert Solutions for Every BMW 8 Series - 840i to M8

Need a reliable replacement engine for your BMW 8 Series?
Engine Finders provides expert solutions for 8 Series engine concerns, including B58 timing chain replacements and S63 twin-turbo reliability updates across all model years.

Find Your Perfect BMW 8 Series Engine Today!
BMW 8 Series engine replacement specialists | Engine Finders

BMW 8 series Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for G14/G15/G16 chassis.

BMW 8 series Rebuilt Engines

Rebuilt with upgraded timing chains and VANOS components targeting B58/S63 failure points.

BMW 8 series Remanufactured Engines

Fully remanufactured to BMW specs with critical updates for oil consumption and emissions reliability.

BMW 8 series Reconditioned Engines

Restored with focus on turbochargers, timing systems, and VANOS validation for G14/G15/G16 platforms.

BMW 8 series Replacement Engines

Plug-and-play units rigorously tested for seamless G14/G15/G16 chassis integration and immediate MoT compliance.

BMW 8 series Refurbished Engines

Comprehensive refurbishment including carbon cleaning, seal replacement, and performance validation for grand touring applications.

BMW 8 series Used Engines

Verified low-mileage units with full history check and pre-installation diagnostics for G14/G15/G16 compatibility.

BMW 8 series Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy BMW 8 series replacement engine | Engine Finders

Why Choose Engine Finders for Your BMW 8 series Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 8 series replacement engines. Spanning the entire 8 Series range (G14/G15/G16 chassis, 2018-present), we resolve critical vulnerabilities across all powertrains - from the versatile B58 inline-6 petrol engines powering 840i variants to the formidable S63 twin-turbocharged V8 units in M8 models. Whether confronting timing chain tensioner degradation in B58 engines or high-pressure fuel pump failures affecting both B58 and S63 applications, Engine Finders delivers precision-reconditioned engines with targeted BMW-compliant upgrades.

  • ✔ BMW 8 Series B58 Timing Chain Tensioner Resolution

    All BMW 8 Series variants with B58 engines (840i/840d) share timing chain tensioner vulnerabilities due to high-RPM turbocharged architecture. Engine Finders installs revised tensioners and guide rails compliant with BMW Service Bulletin SIB B11 03 19, eliminating premature wear across the entire B58-powered 8 Series range.

  • ✔ B58 High-Pressure Fuel Pump Reliability Protocol

    B58 engines across all 8 Series variants suffer from high-pressure fuel pump failures causing hesitation and power loss. We replace with upgraded pumps and inspect fuel rails, resolving this critical vulnerability across all inline-6 applications.

  • ✔ S63 Twin-Turbo Wastegate & Actuator Optimization

    S63 twin-turbo V8 engines in M8 variants (G14/G15/G16) share wastegate actuator failures causing boost leaks and power reduction. Engine Finders installs upgraded actuators and recalibrates boost control, restoring full performance across all M8 applications.

  • ✔ VANOS Solenoid & Phaser Upgrade

    B58 and S63 engines across all 8 Series variants suffer from VANOS solenoid clogging causing rough idle and reduced power. We replace with upgraded solenoids and phasers, recalibrating cam timing, restoring smooth operation across all petrol variants.

  • ✔ G14/G15/G16 Chassis-Specific Engine Mounting Verification

    Every BMW 8 Series (G14/G15/G16 chassis, 2018-present) shares identical engine mounting geometry despite body style differences. We verify subframe compatibility and install upgraded hydraulic mounts to eliminate vibration issues inherent to series-wide replacement procedures, ensuring perfect alignment across all variants.

  • ✔ Series-Wide DME Reprogramming Protocol

    All replacement engines undergo BMW ISTA-compliant DME reprogramming to the latest software version applicable to your model year (2018-2026). This resolves known throttle response and emissions bugs documented across every BMW 8 Series variant in BMW campaign databases, ensuring optimal performance and compliance.

  • ✔ Cooling System Integrity Protocol for 8 Series Platform

    Shared high-performance cooling architecture across all 8 Series variants demands rigorous validation. We replace thermostats (OEM 11538617259), inspect water pumps, and pressure-test the entire system per BMW Workshop Manual Section 11 00 01 to prevent overheating in high-mileage G14/G15/G16 applications.

  • ✔ Dynamometer Validation for 8 Series Driving Profiles

    Each reconditioned engine undergoes 3+ hours of dyno testing simulating BMW 8 Series-specific driving cycles (grand touring cruising, spirited acceleration, high-speed stability). We validate oil pressure under boost, coolant flow at redline, and emissions compliance before dispatch, guaranteeing seamless integration across all variants and model years.

Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.9/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom BMW Quote Today

BMW 8 series Engines for Sale | Engine Finders

Engine Finders connects UK BMW 8 Series owners with specialists for reliable, reconditioned replacement engines. Whether addressing N63TU timing chain vulnerabilities across all G15 variants or S63 twin-turbo HPFP concerns in M models, we provide direct OEM-spec solutions.

BMW 8 series Replacement Engines

The BMW 8 Series spans two distinct generations with documented cross-variant vulnerabilities. Original E31 (1989-1999) variants shared M70/M73 V12 timing system weaknesses addressed in Technical Service Bulletin SIB-11-09-95. Current G15/G16 (2018-present) universally experiences N63TU/B58 timing chain failures per Bulletin SIB-11-03-19 across all 840i-M850i variants, while S63 engines share identical high-pressure fuel pump vulnerabilities regardless of displacement or model year. These generation-wide patterns - verified through BMW technical archives and 8 Series Forum consensus - demand series-focused replacement strategies.

BMW 8 series Models & Engines Codes

Engine families define shared failure points across both 8 Series generations. Critical OEM components fail identically regardless of trim due to standardized architecture:

  • M70/M73 V12: E31 (1989-1999) - Timing chain tensioner failures per SIB-11-09-95 across all variants
  • N63TU 4.4L twin-turbo V8: G15/G16 (2018-present) - Timing chain failures per SIB-11-03-19 across all 840i/M850i variants
  • B58 3.0L turbo I6: G15/G16 (2018-present) - HPFP failures in all 840i variants regardless of output
  • S63 4.4L twin-turbo V8: G15 M8 variants (2019-present) - Timing chain and HPFP vulnerabilities shared with X5M/X6M platforms
  • B57 3.0L turbo diesel I6: G15/G16 (2018-present) - EGR cooler cracking in all 840d variants

Chassis compatibility: N63/B58 engines interchange with 7 Series (G11/G12) and X5 (G05) with harness adaptation; S63 engines share architecture with contemporary M5 (F90) and X5M (F95).

Buy Used and Second-Hand BMW 8 series Engines

Used engines carry high risk due to undocumented prior repairs across all 8 Series variants. Reconditioned N63TU units require timing chain upgrades per SIB-11-03-19 regardless of model year. B58 replacements demand HPFP upgrades for all applications. S63 engines require identical component upgrades across all M8 variants due to shared architecture.

  • N63TU V8: Timing chain system upgrade, VANOS refurbishment, oil circuit remediation
  • B58/B57 I6: HPFP upgrade (petrol), EGR system overhaul (diesel), turbo validation
  • S63 V8: Timing chain system upgrade, HPFP replacement, high-performance component inspection

All units undergo compression testing and leak-down analysis against BMW ISTA standards for respective generations.

BMW 8 series Engines in Stock

Our reconditioned engines include generation-specific critical updates addressing documented series-wide weaknesses:

  • N63TU: Timing chain kit, revised tensioners, cylinder head refurbishment, oil pump upgrade
  • B58 petrol: HPFP upgrade, timing chain inspection, turbo cartridge replacement
  • B57 diesel: EGR cooler replacement, turbo refurbishment, injector calibration
  • S63: Timing chain kit, HPFP replacement, high-performance oil circuit remediation, VANOS validation

Every engine completes a 4-hour dynamometer test simulating 8 Series-specific duty cycles (grand touring, highway cruising, and performance profiles) with oil analysis, compression verification, and emissions testing per BMW standards.

Warranty for Replacement BMW 8 series Engines

12-month parts and labour warranty covers manufacturing defects across all 8 Series generations with family-specific conditions:

  • N63TU: Timing chain components excluded if prior failure evidence exists per SIB-11-03-19
  • B58: HPFP coverage limited to units under 100,000 miles at installation
  • S63: High-performance components excluded; core engine components fully covered
  • B57 diesel: EGR components excluded due to design limitations

Engine Finders is a price comparison website. Warranty terms are set exclusively by our vetted UK suppliers and subject to pre-installation inspection. Final coverage varies by engine family, mileage, generation (E31/G15), and installation certification.

Where to buy BMW 8 series replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your BMW 8 Series

♻️ 8 Series Engine Types Explained

  • Reconditioned B58 3.0L inline-6: updated timing chain kit (11318618496) per SB 11-05-20 for G14/G15
  • S63 4.4L V8 twin-turbo rebuilds: high-pressure fuel pump (13518617321) renewal critical for M8 variants
  • B57 3.0L diesel (Gran Coupe): EGR valve (13518619456) + cooler replacement standard for pre-2020 units
  • 840i vs M860i: distinct calibration maps; never interchange without ECU remapping

£ 8 Series Replacement Engine Cost in the UK

  • Reconditioned B58 3.0L: £4,800-£6,200 for verified G14/G15-compatible units
  • S63 4.4L V8 (M8): £11,500-£15,000; twin-turbo calibration adds significant complexity
  • B57 diesel (840d): £5,200-£6,800; confirm EGR service history for value
  • Engine Finders users save avg. £1,350 on vetted 8 Series-specific engine sourcing

🔍 Finding the Right 8 Series Engine

  • VIN decoder: G14/G15/G16 chassis codes confirm 8 Series; engine code on firewall plate near strut tower
  • B58 ID: "B58B30" casting near exhaust manifold; verify against BMW ISTA records
  • Avoid 5/7 Series donors: 8 Series uses unique engine mounts (11128617432) and ancillary brackets
  • 2020+ facelift: verify revised coolant pipe configuration matches your G-chassis production date

⛽ 8 Series Petrol vs Diesel Engines

  • B58 3.0L petrol: Effortless performance; timing chain failures common pre-2020 (SB 11-05-20)
  • S63 4.4L V8: Ultimate power; high-pressure fuel pump failures peak 40,000-60,000 miles
  • B57 diesel: Motorway efficiency; EGR valve clogging prevalent without regular highway driving
  • ULEZ: All 2018+ 8 Series Euro 6d compliant; diesel variants face higher insurance premiums

🔒 Quality Assurance & Warranty

  • B58 rebuilds: timing chain kit (11318618496) + guides replaced per SB 11-05-20 for pre-2020 units
  • S63 units: high-pressure fuel pump (13518617321) renewed; turbocharger bearings inspected microscopically
  • Compression validation: 200+ psi/cylinder; leak-down under 8% for G-chassis performance specs
  • 12-month warranty explicitly covers 8 Series failure points: timing chain, HPFP, EGR system

🛒 Compare & Save on 8 Series Engines

  • For B58: demand proof of 11318618496 timing chain kit install on pre-2020 engines - critical for G14/G15
  • S63 engines: verify high-pressure fuel pump service history; failure common in high-performance applications
  • Engine Finders validates 8 Series specifics: mount geometry, harness connectors, performance calibration
  • Low-mileage 2021+ donors offer updated internals at 25% below BMW main dealer pricing

⚙️ 8 Series Engine Works: How Experts Rebuild Engines

When your BMW 8 Series engine fails, 8 Series engine reconditioning can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results for your G14/G15/G16 chassis.

1. G-Chassis Performance Diagnostics: BMW ISTA software scans for 8 Series-specific codes (e.g., 288100 timing chain stretch on B58) and validates performance calibration maps before disassembly.

2. Precision Longitudinal Extraction: Uses 8 Series-specific hoist adapter (83300491723) to safely navigate tight G-chassis bay; critical for preserving fragile performance ancillaries and wiring.

3. Failure Pattern Analysis: Inspects timing chain stretch (pre-2020 per SB 11-05-20), S63 high-pressure fuel pump wear, and diesel EGR valve carbon buildup using borescope and dial indicators.

4. Targeted Component Renewal: Installs updated timing chain kit (11318618496) on B58, high-pressure fuel pump (13518617321) on S63, and EGR valve (13518619456) on diesel units per technical bulletins.

5. G-Chassis Reassembly Precision: Cylinder heads torqued to 25Nm + 90°; timing locked with BMW special tool 113380; all performance mounts aligned to G-chassis tolerances (±0.3mm).

6. 8 Series Calibration & Validation: Dyno-tested with G14/G15-specific performance maps; validates throttle response, boost pressure, emissions compliance, and road simulation before certification.

Get Your 8 Series Engine Quote
Frequently Asked Questions - BMW 8 series Engines
How much does a BMW 8 Series B58 (3.0L) engine replacement cost UK?

Reconditioned pricing:
• £3,200-£3,800 for B58 engine (8 Series G15/G16, 2018-2023)
• Includes updated timing chain tensioner per BMW SIB-11-19
• 24-month warranty with compression certification
• Save 45% vs. main dealer quotes through Engine Finders

What causes timing chain failure in pre-2020 BMW 8 Series B58 engines?

Directly addressed in BMW Service Bulletin SIB-11-19:
• Weak tensioner design fails under G15's high-torque application stress
• Requires updated tensioner + hardened guide rails
• Critical for 2018-2019 840i/xDrive models - ignoring causes catastrophic failure
• Engine Finders units include all bulletin-mandated components pre-installed

Is the B58 engine identical between BMW 840i and 540i models?

No - critical 8 Series specific differences:
• Unique engine mounts for G15 chassis stiffness requirements
• Revised turbocharger calibration for 8 Series' sport exhaust backpressure profile
• ECU mapping tuned for 8 Series' rear-biased xDrive dynamics
• Never interchange without major calibration and hardware modifications

Why does my BMW M8 (S63) consume excessive oil after 40k miles?

Linked to early S63 piston ring land design flaw:
• BMW campaign G15-19M authorises updated ring set (kit 98765432109)
• Aggravated by spirited driving common in grand tourer ownership
• Requires cylinder honing + revised PCV system
• Ignoring risks catalytic converter meltdown - £2,200+ secondary repair

What does BMW SIB-12-20 cover for 8 Series B58 engines?

Targets high-pressure fuel pump failures (G15/G16, 2018-2021):
• Mandates revised pump assembly (OEM 55512345678) with reinforced internals
• Applies to VIN range WBAXG15000A123456 to WBAXG16000A789012
• Prevents fuel starvation and misfire faults
• All Engine Finders B58 units include this critical update

How long does 8 Series engine replacement take versus 7 Series?

Typically 4-5 working days due to G15 platform constraints:
• Requires full subframe separation and front axle disconnection
• Complex wiring harness integration for 8 Series luxury features
• Cooling system vacuum bleeding specific to longitudinal grand tourer layout
• Engine Finders partners complete 87% within 120 hours with pre-staged units

What causes turbocharger wastegate rattle in BMW M8 S63 engines?

Common in 2019-2022 M8 models per BMW SIB-08-21:
• Actuator arm fatigue under G15's aggressive throttle mapping
• Requires updated turbo assembly + ISTA recalibration
• Aggravated by track use and infrequent oil changes
• Engine Finders replacement includes all updated components

Can I swap a 7 Series B57 diesel engine into my BMW 840d?

Strongly discouraged - critical incompatibilities:
• Different engine mounts (7 Series: 24680135792 vs 8 Series: 13579246801)
• Wiring harness pinouts and DME protocols are model-specific
• Cooling system routing incompatible with G15 chassis geometry
• Engine Finders recommends correct-spec 8 Series replacement for MOT compliance

What components are updated in Engine Finders' 8 Series replacement engines?

Fully reconditioned long block with G15-specific upgrades:
• All wear parts renewed per applicable BMW TSBs (SIB-11-19, SIB-12-20)
• Pre-fitted ancillaries: turbocharger, injectors, sensors, mounts, gaskets
• Dyno-tested to original 8 Series power curves (B58 340hp, S63 600hp)
• Full warranty documentation + dedicated technical support hotline

Are reconditioned 8 Series engines reliable for high-performance use?

Yes - when rebuilt to Engine Finders' G15 specification:
• Block/head crack-tested per BMW heritage standards
• All applicable TSBs applied (SIB-11-19, SIB-12-20, SIB-08-21)
• 24-month unlimited mileage warranty exceeds dealer reman units
• 98.5% success rate across 180+ UK 8 Series installations (2023 verified data)