How much does a Land Rover Defender 90 Octa engine replacement cost-

A fully rebuilt Land Rover Defender 90 Octa 4.4L V8 MHEV engine typically costs between £10,000 and £16,000 for supply only, with supply and fit packages ranging higher depending on the specialist. - Supply-only rebuilt: £10,000-£16,000 [INDUSTRY ESTIMATE] - Supply & fit: £12,000-£18,000 [INDUSTRY ESTIMATE] - Always ensure the quote includes a minimum 12-month warranty.

What are the signs of turbo or coolant failure in a Land Rover Defender 90 Octa-

The 4.4L hot-vee V8 is prone to thermal stress on turbocharger coolant lines. Early warning signs include unexplained coolant loss, white smoke from the exhaust, overheating warnings, or a sweet smell from the engine bay. - Monitor the coolant reservoir for unexplained drops in level. - Check for white exhaust smoke, especially under load. - Address overheating warnings immediately to prevent catastrophic damage.

Can the 4.4L V8 MHEV engine be upgraded or remapped after replacement-

While performance tuning is popular, any modifications to the engine management system or mild-hybrid components may void the 12-month warranty provided by the rebuilding specialist. - Like-for-like replacements guarantee OEM fitment and warranty validity. - Remapping should only be discussed with your chosen specialist post-installation. - EnginesMarket focuses on direct, reliability-focused replacements.

Land Rover Defender 90 Octa SPECIALISTS

Land Rover Defender 90 Octa Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Land Rover Defender 90 Octa engine specialists. Compare prices on reconditioned, rebuilt and used engines to ensure a reliable and cost-effective replacement for your ultra-high-performance 4x4.

Supply & Fit Available

12-Month Warranty

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100+ Suppliers

Land Rover Defender 90 Octa Engine

from£10,000 to £16,0...

Usedfrom £6,000
Reconditionedfrom £8,500
Common codes4.4L V8 MHEV (P635)

Land Rover defender-90 Octa Used Engine — 4.4L V8 MHEV (P635)

Land Rover defender-90Used Engine — 4.4L V8 MHEV (P635)

Land Rover defender-90 Octa Reconditioned Engine — 4.4L V8 MHEV (P635)

Land Rover defender-90Reconditioned Engine — 4.4L V8 MHEV (P635)

Land Rover defender-90 Octa Rebuilt Engine — 4.4L V8 MHEV (P635)

Land Rover defender-90Rebuilt Engine — 4.4L V8 MHEV (P635)

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Land Rover Defender 90 Octa Engine History & Specs at a Glance

When the Defender 90 Octa launched, it established a new pinnacle of extreme performance for the iconic short-wheelbase 4x4, introducing a formidable twin-turbo V8 mild-hybrid powertrain paired with advanced 6D Dynamics Pro suspension.

2024
4.4L V8 MHEV (P635), 4.4L, 635PS (Launch of the Octa variant, featuring a BMW M-derived twin-turbo V8 with mild-hybrid assistance, delivering unparalleled on-road speed and extreme off-road capability).

Every engine fitted to the Land Rover Defender 90 Octa is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Land Rover Defender 90 Octa Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

4.4L V8 MHEV (P635) — 4.4L Petrol MHEV (2024-present)

Power Output: 635PS (626bhp)
Years Fitted: 2024-present

Can’t find your exact engine code?-> Get quotes for 4.4L V8 MHEV Land Rover Defender 90 Octa engine replacement

-> Get quotes for 4.4L V8 MHEV Land Rover Defender 90 Octa engine replacement

Common failure points and repair options

Turbocharger & Coolant System Wear

Affected: Land Rover Defender 90 Octa (4.4L V8 MHEV, 2024-present)
Typical failure mileage: 40,000-80,000 miles

Root cause

The hot-vee V8 architecture subjects turbocharger coolant lines and seals to intense heat, leading to premature degradation and potential coolant leaks into the combustion chamber or oil system.

Repair options

Repair tier	Dealer price	Specialist price
Coolant Line & Seal Replacement	£1,500-£2,500	£1,000-£1,800
Full Replacement - rebuilt/reconditioned engine	£12,000-£18,000	£10,000-£16,000

Our recommendation

For isolated coolant leaks, specialist repair is viable. However, given the vehicle's value and the complexity of the hot-vee layout, a full rebuild with upgraded seals is the most reliable long-term solution.

-> Compare rebuilt 4.4L V8 MHEV Land Rover Defender 90 Octa engine prices

Valve Stem Seal & Oil Consumption Issues

Affected: Land Rover Defender 90 Octa (4.4L V8 MHEV, 2024-present)
Typical failure mileage: 50,000+ miles

Root cause

High operating temperatures and aggressive driving cycles can accelerate the hardening of valve stem seals, leading to increased oil consumption and blue smoke on startup.

Repair options

Repair tier	Dealer price	Specialist price
Valve Stem Seal Replacement	£2,500-£4,000	£1,800-£3,000
Full Replacement - rebuilt/reconditioned engine	£12,000-£18,000	£10,000-£16,000

Our recommendation

If oil consumption is minor, top-ups and specialist monitoring suffice. For significant consumption, a rebuilt engine with upgraded seal materials provides a comprehensive, warrantied reset.

-> Compare rebuilt 4.4L V8 MHEV Land Rover Defender 90 Octa engine prices

Don't Let Engine Failure Write Off Your Land Rover Defender 90 Octa

Protect your ultra-premium investment with a rebuilt engine that addresses the 4.4L V8 MHEV's known thermal weaknesses. Every engine supplied through our network features upgraded components, comes with a minimum 12-month unlimited mileage warranty, and is available with nationwide supply and fit to get your Defender back on the road.

Compare Land Rover Defender 90 Octa Engine Replacement Prices Now ->

FAQ

Land Rover Defender 90 Octa Engine ReplacementFrequently Asked Questions

Everything Land Rover Defender 90 Octa owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A fully rebuilt Land Rover Defender 90 Octa 4.4L V8 MHEV engine typically costs between £10,000 and £16,000 for supply only, with supply and fit packages ranging higher depending on the specialist.

Supply-only rebuilt: £10,000-£16,000 [INDUSTRY ESTIMATE]
Supply & fit: £12,000-£18,000 [INDUSTRY ESTIMATE]
Always ensure the quote includes a minimum 12-month warranty.

-> Compare Land Rover Defender 90 Octa engine replacement quotes today.

The 4.4L hot-vee V8 is prone to thermal stress on turbocharger coolant lines. Early warning signs include unexplained coolant loss, white smoke from the exhaust, overheating warnings, or a sweet smell from the engine bay.

Monitor the coolant reservoir for unexplained drops in level.
Check for white exhaust smoke, especially under load.
Address overheating warnings immediately to prevent catastrophic damage.

-> If you notice these symptoms, get a Land Rover Defender 90 Octa engine quote immediately.

Yes, investing in a rebuilt engine is financially sound. With Land Rover Defender 90 Octa values currently ranging from £140,000 to over £160,000, a £10,000-£16,000 replacement is a small fraction of the vehicle's worth and preserves this ultra-premium asset.

Classic and modern premium Defender values easily absorb rebuild costs.
A rebuilt engine resets the mechanical lifespan with upgraded components.
Upgraded seals prevent repeat thermal failures.

-> Check Land Rover Defender 90 Octa rebuilt engine prices now.

A standard supply and fit service for a Land Rover Defender 90 Octa typically takes 3 to 5 days at a specialist workshop. The complex 6D Dynamics Pro suspension and tight engine bay require meticulous removal and calibration.

Removal and installation: 2-3 days.
Fluid top-up, system bleeding, and ECU calibration: 1-2 days.
Always confirm turnaround times with your chosen specialist.

-> Book your Land Rover Defender 90 Octa supply and fit service today.

While performance tuning is popular, any modifications to the engine management system or mild-hybrid components may void the 12-month warranty provided by the rebuilding specialist.

Like-for-like replacements guarantee OEM fitment and warranty validity.
Remapping should only be discussed with your chosen specialist post-installation.
EnginesMarket focuses on direct, reliability-focused replacements.

-> Get quotes for direct-fit Land Rover Defender 90 Octa engines here.

Why Choose Us

Compare Land Rover Defender 90 Octa Engine Prices Today

Comparing quotes is completely free and carries no obligation. By entering your registration, you ensure that the quotes you receive are specifically matched to your exact Land Rover Defender 90 Octa and its unique 4.4L V8 MHEV engine code, connecting you directly with vetted UK specialists who understand ultra-high-performance 4x4s.

100+100+ Ultra-premium Defender engines supplied through our network

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