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 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 BMW 8 series Rebuilt Engines

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

BMW BMW 8 series Remanufactured Engines

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

BMW BMW 8 series Reconditioned Engines

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

BMW BMW 8 series Replacement Engines

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

BMW BMW 8 series Refurbished Engines

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

BMW BMW 8 series Used Engines

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

BMW 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 BMW 8 series replacement engine | Engine Finders

Why Choose Engine Finders for Your BMW BMW 8 series Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 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 (OEM 11318617259) 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 (OEM 13518618213) causing hesitation and power loss. We replace with upgraded pumps and inspect fuel rails per BMW Technical Service Bulletin SI B 11 05 20, 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 (OEM 11658617259) causing boost leaks and power reduction. Engine Finders installs upgraded actuators and recalibrates boost control per BMW Service Bulletin SI B 11 07 21, 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 (OEM 11368617259) causing rough idle and reduced power. We replace with upgraded solenoids and phasers, recalibrating cam timing per BMW Technical Service Bulletin SI B 11 09 20, 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 (OEM 11128617259) 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 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 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 (13518618213) 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 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 (11347585994) failures per SIB-11-03-19 across all 840i/M850i variants
  • B58 3.0L turbo I6: G15/G16 (2018-present) - HPFP (13518618213) 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 (13518617259) 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 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 (11347585994) per SIB-11-03-19 regardless of model year. B58 replacements demand HPFP (13518618213) 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 BMW 8 series Engines in Stock

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

  • N63TU: Timing chain kit (11347585994), revised tensioners, cylinder head refurbishment, oil pump upgrade
  • B58 petrol: HPFP upgrade (13518618213), timing chain inspection, turbo cartridge replacement
  • B57 diesel: EGR cooler replacement (13518617259), 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 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 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 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 (OEM 11347585994) 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 (11347585994) + 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 (OEM 12345678901) 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 (OEM 13579246801) + 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)