Land Rover Defender V8 Engine Replacement: Rebuilt & Reconditioned Units, Compare UK Prices

Land Rover Defender V8 Engines for Sale | Engine Finders

The Defender V8 brings JLR's own 5.0L supercharged petrol V8 to the New Defender range, introduced partway through the L663 production run with badge and tune varying by model year and body style, adding a genuinely different character to a range otherwise defined by its modern Ingenium four-cylinder and six-cylinder engines. Before going any further, it's worth stating the single most important thing about this page clearly: the standard Defender V8 is a completely different engine to the Defender OCTA's V8, despite both being casually described as "the V8 Defender." One is JLR's own AJ133-family unit, a naturally aspirated architecture with supercharging bolted on; the other is genuinely BMW-sourced, a twin-turbocharged design with an entirely separate engineering history. Engine Finders sources verified reconditioned engines matched to your exact confirmed badge - P425, P500 or P525 - rather than treating "V8" as a single interchangeable specification across the whole New Defender range, since assuming badge equivalence is exactly the kind of mistake that leads to a costly, avoidable mismatch.

Land Rover Defender V8 Replacement Engines

Here's what the standard Defender V8 actually covers:

• P425 / P500 / P525 - 5.0L supercharged V8 petrol, AJ133 family. Badge denotes state of tune, varying by model year and body style (90, 110 or 130) rather than representing entirely different engine architectures.

Genuinely separate from this, the Defender OCTA uses its own distinct engine - a BMW-sourced 4.4L twin-turbo V8 badged P540 OCTA - which we cover on its own dedicated page given how important it is not to conflate the two. If you're not certain which V8 your specific Defender has, checking against your VIN or confirming whether your vehicle is genuinely OCTA-badged resolves the question quickly. This distinction isn't a minor technicality - the two engines share no common parts, no common architecture and no common sourcing, so a supplier unfamiliar with the difference could easily quote you for entirely the wrong unit, resulting in a costly delay while the mistake gets sorted out.

Defender V8 Models & Engine Codes

V8 availability and specific tune have varied across the L663's production run, and unlike the core Ingenium range where trim level maps fairly predictably to engine code, the V8's availability has shifted more noticeably by body style and model year. This is worth understanding before you assume your specific 90, 110 or 130 necessarily carries the same tune as a superficially similar example from a different production year:

• P425 represented earlier tune levels of the AJ133 5.0L supercharged family as fitted to New Defender.
• P500 denotes a higher output tune of the same underlying engine architecture.
• P525 represents the highest standard tune currently offered, though availability has varied by body style and model year, and hasn't necessarily been offered simultaneously across all three wheelbases at every point in the range's history.

None of these three badges are confirmed as freely interchangeable without specialist verification - always check your exact tune against your VIN before ordering a replacement, particularly given how JLR has adjusted V8 availability across different Defender bodies at different points. A specialist can also advise on realistic parts availability for your specific tune, which varies meaningfully given how much less common the V8 is compared with the core Ingenium range across the whole New Defender line-up, and this kind of upfront honesty about lead times saves considerable frustration later.

Buy Used and Second-Hand Defender V8 Engines

We offer used, reconditioned, rebuilt and remanufactured units for the Defender V8's 5.0L engine, across all confirmed tune levels:

• Used - lower cost, though genuine provenance verification matters more on a performance V8 than on the standard Ingenium range.
• Reconditioned - documented AJ133-family wear points addressed as standard.
• Rebuilt - stripped and rebuilt to factory spec, matched to your confirmed tune.
• Remanufactured - the most thorough option for owners wanting the closest thing to factory-fresh V8 performance.

Every option comes from our vetted UK supplier network and is bench-tested before dispatch, with your exact tune confirmed before any quote is finalised. Given the V8's genuinely more specialist positioning within the wider New Defender range, we'd always recommend discussing your specific requirements with our team directly rather than requesting a generic quote, since getting the tune right first time avoids a costly and time-consuming mismatch.

Defender V8 Engines in Stock

Given the V8's more specialist positioning within the L663 range, lead times can be longer than for the core Ingenium engines - always confirm current availability at quote stage rather than assuming stock levels match the more common diesel and petrol four-cylinder options. Every reconditioned Defender V8 engine we supply includes:

• AJ133-family cooling system inspection
• Timing component verification against documented wear patterns
• Oil system checks specific to the supercharged architecture
• New gaskets, seals and oil pump on every rebuild

Every unit is bench-tested before it leaves our network, confirmed against your exact tune - P425, P500 or P525 - so you receive the correct calibration and performance characteristics for your specific vehicle, not a generic V8 rebuild that happens to fit.

Warranty for Replacement Defender V8 Engines

All reconditioned and rebuilt Defender V8 engines come with the same standard of cover, regardless of your specific tune:

• 12-month, unlimited-mileage warranty
• UK-wide supply and fit network
• Bench-test verification before dispatch

Engine Finders is a price comparison marketplace - warranty terms are set by our vetted UK suppliers and confirmed at quote stage, particularly worth reading closely on a performance engine like this where individual supplier coverage can vary more than on the higher-volume Ingenium range.