How much does a Land Rover Range Rover D350 engine replacement cost in the UK?

A reconditioned D350 3.0-litre Ingenium diesel engine typically costs £5,500–£8,500 supply only. Used engines are available from £3,500–£5,500. Fitting adds £1,300–£2,500 depending on your location and workshop. Use our calculator for a figure specific to your Range Rover.

Is the Land Rover Range Rover D350 engine reliable?

The D350 is powered by JLR's 3.0-litre Ingenium straight-six diesel — a meaningfully more robust engine than the troubled 2.0-litre diesel. However, it has known issues: front engine cover oil leaks (a known JLR warranty pattern), timing chain stretch (oil dilution from DPF regeneration is a contributing factor), DPF clogging (urban use), and EGR cooler failures. The Auto Express long-term test reported a few glitches but none major. Regular maintenance (12,000-mile oil changes with 0W-30 JLR-spec oil) is essential.

What are the common problems with the Land Rover Range Rover D350?

The most frequently reported issues are front engine cover oil leaks (a known warranty pattern affecting Defenders, Discoveries and Range Rovers with the Ingenium engine), timing chain stretch (accelerated by oil dilution from DPF regeneration), DPF clogging (short urban journeys), and EGR cooler failures. The 3.0-litre is less prone to these issues than the 2.0-litre, but vigilance is still required.

Is it worth replacing a Range Rover D350 engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £70,000–£100,000 Range Rover, a £7,000 recon is 7–10% of the car's value — definitely worth it. Against a high-mileage £40,000 example, the same recon approaches our 60% Land Rover threshold — get a scrap valuation first.

How do I find my Range Rover D350 engine code?

Listed on the VIN plate and vehicle documentation. The D350 carries the engine code AJ20D6 (also referred to as DT306 in some documentation). It's a 3.0-litre straight-six twin-turbo diesel with a 48V mild-hybrid system, used in the L405 (2020–2022) and L460 (2022–present) Range Rover.

Can I repair the timing chain, or does it need full engine replacement?

Yes — if caught early. A preventative timing chain and tensioner replacement costs £1,200–£2,500. Oil dilution from failed DPF regenerations is a key contributor to timing chain wear. If ignored and the chain snaps, the engine is an interference design — pistons and valves collide, resulting in catastrophic engine damage. At the first sign of cold-start rattle, book an inspection immediately. Regular oil changes using 0W-30 JLR-spec oil are the single most effective preventative measure.

Land Rover Range Rover D3502020–present3.0 Ingenium Twin-Turbo Diesel MHEV

Land Rover Range Rover D350 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Range Rover D350 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

Get quotes today from trusted UK Land Rover Range Rover specialists. Compare reconditioned, rebuilt and used 3.0-litre Ingenium twin-turbo diesel engines with MHEV — supply & fit available nationwide.

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Range Rover D350 Engines — from £4,000 to £10,500Code: <a href='https://landroverengine.uk/engine/aj20d6'>AJ20D6</a> / DT306

Range Rover D350 Engines — from £4,000 to £10,500· Code: <a href='https://landroverengine.uk/engine/aj20d6'>AJ20D6</a> / DT306

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The D350 THROUGH TIME — Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

Proven 3.0 Ingenium diesel; front-cover oil leaks a known pattern

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L405 Range Rover BMW 320d L405 Range Rover

2020–2022AJ20D6 / DT306 (3.0L Ingenium I6 Twin-Turbo Diesel MHEV)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£5,500–£8,500 [PLACEHOLDER — confirm vs cost sheet]Proven 3.0 Ingenium diesel; front-cover oil leaks a known pattern

L460 Range Rover BMW 320d L460 Range Rover

2022–presentAJ20D6 / DT306 (3.0L Ingenium I6 Twin-Turbo Diesel MHEV)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£5,500–£8,500 [PLACEHOLDER — confirm vs cost sheet]Same engine hardware; modern L460 platform

Why use this era map?

This table is the single source every other section on this page matches — Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Land Rover Range Rover D350 Engine Replacement Costs

Supply Only£5,500–£8,500

Fitted (Indie)£6,800–£10,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£4,800–£7,2001–6 monthsBudget priority; lower-mileage examples

Reconditioned Engine£5,500–£8,500£6,800–£10,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£6,500–£9,500£7,800–£11,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£10,000–£14,000+£11,500–£16,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the AJ20D6 3.0-litre Ingenium diesel. Most Range Rover engine replacements range between £4,500 and £12,000 depending on engine type and specification.

Labour estimate: Fitting a Range Rover D350 engine typically takes 15–25 hours at £70–£100/hr (independent) or £120–£180/hr (London/SE dealer).

→ Compare D350 engine prices from UK specialists

Common Problems

1. Front Engine Cover Oil Leak

Symptoms: Oil spots on the garage floor, oil smell from the engine bay, low oil level warning, visible oil residue around the front of the engine.

Typical mileage: 15,000–30,000 miles (can occur on nearly new vehicles)

Repair cost: £800–£1,500 (front cover + crank seal replacement)【PLACEHOLDER — confirm vs cost sheet】

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

This is a known JLR warranty issue affecting Defenders, Discoveries and Range Rovers with the Ingenium diesel. The remedy involves replacing the front engine cover and front crank seal. If your D350 is exhibiting oil leaks, have it inspected promptly — while not catastrophic if caught early, ignoring it can lead to low oil levels and potential engine damage. The repair, once done in a workshop rather than on the production line, is reportedly better than when it came out of the factory.

Read the full oil leak guide

1. Front Engine Cover Oil Leak

Symptoms: Oil spots on the garage floor, oil smell from the engine bay, low oil level warning, visible oil residue around the front of the engine.

Typical mileage: 15,000–30,000 miles (can occur on nearly new vehicles)

Repair cost: £800–£1,500 (front cover + crank seal replacement)【PLACEHOLDER — confirm vs cost sheet】

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full oil leak guide

2. Timing Chain Stretch & Oil Dilution

Symptoms: Rattling noise on cold start, metallic ticking from the engine, engine warning light, DPF filling prematurely.

Typical mileage: 50,000–100,000 miles

Repair cost: £1,200–£2,500 (chain + tensioner replacement)【PLACEHOLDER — confirm vs cost sheet】

Replacement cost: £5,500–£9,500 (if chain skips and valves contact pistons)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

Oil dilution from failed DPF regeneration is a key contributor to lubrication degradation in Ingenium engines, accelerating timing chain wear. Stretched timing chains can cause the DPF to fill prematurely, creating a cascade of failures. At the first sign of cold-start rattle, get the chain and tensioners inspected immediately. Regular oil changes using the correct 0W-30 spec oilare the single most effective preventative measure.

Read the full timing chain failure guide

3. DPF Clogging & EGR Cooler Failures

Symptoms: DPF warning light, reduced performance, increased fuel consumption, failed regeneration cycles, white smoke from exhaust.

Typical mileage: 40,000–80,000 miles (urban-driven vehicles)

Repair cost: £300–£900 (forced regeneration, DPF clean, or EGR cooler replacement)

Replacement cost: N/A — repair only

🟡 Monitor - book inspection soon

Our recommendation:

The Ingenium diesel's DPF is sensitive to short urban journeys. Cracked EGR coolers can allow coolant to enter the combustion system. If you predominantly drive in town, ensure the vehicle completes regular regeneration cycles — a motorway run at 2,000+ rpm for 20 minutes at least once a week is recommended. The 3.0-litre is less prone to these issues than the 2.0-litre, but they remain a known pattern.

Read the full DPF failure guide

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Range Rover D350 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Range Rover D350 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseFront engine cover oil leak✅ Yes£800–£1,500Warranty-covered on many examples; straightforward fixTiming chain stretch✅ Yes£1,200–£2,500Preventative — catches the fault before catastrophic failureDPF clogging✅ Yes£300–£900Forced regeneration or DPF clean — less than replacementEGR cooler failure✅ Yes£600–£1,200Specialist repair availableChain snap (valve contact)❌ Usually No£5,500–£9,500Typically requires full engine replacement or complete rebuild

Buying This D350? Check These First

Buy If

Documented front engine cover inspection or replacement (warranty work completed)
Full service history with 0W-30 JLR-spec oil at 12,000-mile (or less) intervals
Evidence of DPF-friendly driving — regular motorway runs
No cold-start rattle — a quiet startup suggests healthy timing chain

Avoid If

Oil leaks with no documented front cover repair history
No proof of regular oil changes — the Ingenium diesel is unforgiving of neglect
DPF warning light with no regeneration history
Engine warning light with timing, EGR, or DPF codes and no diagnosis

Closing Verdict

The D350 is the high-output diesel in the Range Rover line-up, powered by JLR's 3.0-litre Ingenium straight-six. It's a meaningfully more robust engine than the troubled 2.0-litre diesel, but it's still a modern diesel with modern diesel problems — front-cover oil leaks, timing chain vigilance, and DPF/EGR maintenance are the price of entry. Buy on documented history, not on faith. A well-maintained D350 is a £70,000–£100,000 luxury SUV; a neglected one is a £7,000 engine replacement waiting to happen.

Don't guess.Get the right engine at the right price.

→ Compare D350 engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare D350 engine prices before you buy

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Buying Checklist

Before you buy a used Land Rover Range Rover D350 (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling or metallic ticking on startup (timing chain wear warning)

Service History — including the D350 era and confirmed oil-change intervals using 0W-30 JLR-spec oil

Oil Leak Check — Any history of oil leaks? (front engine cover is a known weak point)

DPF Check — Check for DPF warning light or evidence of regeneration issues (urban-driven vehicles are high risk)

Smoke Check — White smoke on startup can indicate EGR coolant leak

Oil Level — Check the dipstick; any evidence of oil dilution from failed DPF regenerations?

Engine Warning Light — Have codes been read? Any unresolved timing, EGR, DPF, or injector issues?

MOT History — Check for emissions-related failures (DPF, EGR, or injector-related)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

AJ20D6 / DT306 (3.0L Ingenium I6 Twin-Turbo Diesel MHEV)

Years2020–present

Power350 PS (345 HP / 257 kW) @ 4,000 rpm · 700 Nm @ 1,500 rpm

2025 Enquiries— (pattern data)

Avg. Recon Cost£5,500–£8,500 [PLACEHOLDER — confirm vs cost sheet]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20D6 / DT306 (3.0L Ingenium I6 Twin-Turbo Diesel MHEV)2020–present350 PS (345 HP / 257 kW) @ 4,000 rpm · 700 Nm @ 1,500 rpm— (pattern data)£5,500–£8,500 [PLACEHOLDER — confirm vs cost sheet]

Technical Specs

AJ20D6 / DT306

Displacement2,997 cc

CylindersStraight-6, 4 valves per cylinder

Compression Ratio15.5:1

Fuel SystemDirect injection

TurbochargerTwin-turbocharged with 48V MHEV system

→ Compare D350 engine prices for your Range Rover

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Market Intelligence

Most Common Failure

Front engine cover oil leaks — known JLR warranty issue affecting Ingenium diesel vehicles

Average Enquiry Mileage

40,000

–70,000 miles

[PATTERN DATA]

Average Replacement Cost

£5,500

–£8,500 reconditioned, supply only

[PLACEHOLDER — confirm vs cost sheet]

Most Requested Engine Code

AJ20D6 / DT306

[PATTERN DATA]

Peak Enquiry Season

Winter — cold starts expose timing chain wear【PATTERN DATA】

Regional Demand

South East20%

South West16%

Midlands14%

PATTERN DATA

Regional Demand Breakdown

20%South East

FAQ

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

Why UK Land Rover Range Rover D350 Owners Trust LandRoverEngine.uk

Trusted D350 Ingenium Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Range Rover owners, as part of the Engine Finders network, covering the entire AJ20D6 era from 2020 onwards across both L405 and L460 generations.
Compare D350 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, across every Range Rover that left the factory with this 3.0-litre twin-turbo diesel.
UK Engine Replacement Services for D350
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Find the best Land Rover Range Rover D350 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your Range Rover back on the road with confidence.

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