Land Rover Defender 90 Octa Engine ReplacementCompare 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
Nationwide Delivery
100+ Suppliers
From £10,000 to £16,000 [INDUSTRY ESTIMATE]
Used from £6,000 · Reconditioned from £8,500 · Common codes: 4.4L V8 MHEV (P635)
From £6,000
Tested, bare/short engine
From £8,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Land Rover Defender 90 Octa specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Land Rover Defender 90 Octa Replacement Engineto Finding the Best Land Rover Defender 90 Octa Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryLand 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.
Variant HistoryLand 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.
Land Rover Defender 90 Octa
Fuel TypePetrol MHEV
Engine Size Range4.4L (4395cc)
Power Output Range635PS (626bhp)Engine History Timeline
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).
Key Specs Snapshot
Fuel TypePetrol MHEVEngine Size Range4.4L (4395cc)Power Output Range635PS (626bhp)Years Produced2024-presentEvery engine fitted to the Land Rover Defender 90 Octa is covered below, with UK rebuilt pricing and known failure points.
Land Rover Defender 90 Octa Engine Codes - Specifications & Replacement CostLand Rover Defender 90 Octa Engine Codes - Specifications & Replacement Cost
4.4L Petrol MHEV (2024-present)
Power Output635PS (626bhp)Years Fitted2024-present
Compatible Trim Levels
- Defender 90 Octa
- Defender 90 Octa Edition One
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£6,000-£9,000 [INDUSTRY ESTIMATE]
Reconditioned
Addressed known issues, tested
£8,500-£12,000 [INDUSTRY ESTIMATE]
Rebuilt
Full teardown, upgraded internals
£10,000-£16,000 [INDUSTRY ESTIMATE]
Common Failure
As a high-performance, heavily stressed unit, early wear on turbocharger coolant lines, valve stem seals, and complex mild-hybrid system components are the primary concerns, alongside potential oil consumption at higher mileages.
The Land Rover Defender 90 Octa is an engineering marvel, but its 4.4L twin-turbo V8 MHEV operates under extreme thermal and mechanical loads. Rebuilt engines through EnginesMarket include upgraded components addressing these original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the Land Rover Defender 90 Octa 4.4L V8 MHEV Experiences Thermal Stress
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£1,500-£2,500
Specialist (parts + labour)
£1,000-£1,800
What it involves
Replace degraded turbo coolant lines, seals, and pressure test the cooling system.
Suitability
Viable for isolated leaks if the engine block and internals are otherwise healthy.
1 - 2 daysDealer (parts + labour)
£12,000-£18,000
Specialist (parts + labour)
£10,000-£16,000
What it involves
Supply & fit of a fully rebuilt 4.4L V8 MHEV with upgraded seal materials, plus 12-month warranty.
Suitability
Recommended for high-mileage units or if overheating has caused secondary internal damage.
1 - 2 days
All prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Coolant Line & Seal Replacement Minor | £1,500-£2,500 | £1,000-£1,800 | Replace degraded turbo coolant lines, seals, and pressure test the cooling system. | Viable for isolated leaks if the engine block and internals are otherwise healthy. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £12,000-£18,000 | £10,000-£16,000 | Supply & fit of a fully rebuilt 4.4L V8 MHEV with upgraded seal materials, plus 12-month warranty. | Recommended for high-mileage units or if overheating has caused secondary internal damage. | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Land Rover Defender 90 Octa (2024-present) currently holds a value of £140,000-£160,000+ in the UK [THIRD-PARTY]. This places it firmly in the £15,000+ band, meaning a £10,000-£16,000 rebuilt engine replacement is a small fraction of the vehicle's worth and is highly recommended to preserve this ultra-premium asset. Flag: Safe.
Our Recommendation
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.
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 rebuilt 4.4L V8 MHEV Land Rover Defender 90 Octa engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Land Rover Defender 90 Octa. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
Land Rover Defender 90 Octa Engine ReplacementFrequently Asked Questions
Question 1How 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.
Question 2What 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.
Question 3Is it worth replacing the engine in a Land Rover Defender 90 Octa-
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.
Question 4How long does a Land Rover Defender 90 Octa engine replacement take-
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.
Question 5Can 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.
Why Choose UsCompare Land Rover Defender 90 OctaEngine PricesToday
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12-Month Warranty on every rebuilt Land Rover Defender 90 Octa engine
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