Jaguar XJ 3.0D Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Jaguar XJ 3.0D engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the best supply & fit solution for your 3.0-litre diesel saloon.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £7,500 to £11,000 [EM-QUOTE]
Used from £3,500 · Reconditioned from £6,500 · Common codes: 306DT, 30DDTX
From £3,500
Tested, bare/short engine
From £6,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Jaguar XJ 3.0D specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Jaguar XJ 3.0D Replacement Engineto Finding the Best Jaguar XJ 3.0D Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryJaguar XJ 3.0D - Engine History & Specs at a Glance
When the 3.0D variant launched, it served as the torque-rich, long-distance cruiser of the XJ range, utilising the robust AJD-V6 architecture. Throughout its production run across both late X350 and X351 generations, it retained this singular 3.0L V6 diesel configuration, prioritising refinement and high-speed economy.
Variant HistoryJaguar XJ 3.0D - Engine History & Specs at a Glance
When the 3.0D variant launched, it served as the torque-rich, long-distance cruiser of the XJ range, utilising the robust AJD-V6 architecture. Throughout its production run across both late X350 and X351 generations, it retained this singular 3.0L V6 diesel configuration, prioritising refinement and high-speed economy.
Jaguar XJ 3.0D
Fuel TypeDiesel
Engine Size Range3.0L
Power Output Range207-300hpEngine History Timeline
306DT 3.0L V6 Diesel, 207hp (Introduction of the 3.0 TDV6 to the late X350 generation, replacing the 2.7L unit).
306DT 3.0L V6 Diesel, 237-275hp (Launch of the X351 generation, featuring revised ECU mapping and improved emissions compliance).
30DDTX 3.0L V6 Diesel, 296-300hp (Introduction of the sequential twin-turbo SDV6 for flagship executive and LWB variants).
Final model year for the 3.0D as Jaguar shifted the XJ range toward mild-hybrid inline-six configurations.
Key Specs Snapshot
Fuel TypeDieselEngine Size Range3.0LPower Output Range207-300hpYears Produced2007-2019Every engine fitted to the Jaguar XJ 3.0D is covered below, with UK rebuilt pricing and known failure points to help you make an informed replacement decision.
Jaguar XJ 3.0D Engine Codes - Specifications & Replacement CostJaguar XJ 3.0D Engine Codes - Specifications & Replacement Cost
3.0L V6 Diesel (2007-2016)
Power Output207-275hpYears Fitted2007-2016
Compatible Trim Levels
- Executive 3.0 TDV6
- Portfolio 3.0 TDV6
- Sovereign 3.0 TDV6
- R-Sport 3.0 TDV6
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,500-£5,500
Reconditioned
Addressed known issues, tested
£6,500-£9,500
Rebuilt
Full teardown, upgraded internals
£7,500-£11,000
Common Failure
EGR cooler internal cracking leading to coolant loss, turbo actuator sticking, and timing chain tensioner wear, typically emerging between 70,000 and 110,000 miles.
The Jaguar XJ 3.0D reliability profile is defined by the AJD-V6 3.0L V6 diesel architecture. While renowned for its smooth motorway cruising and strong torque delivery, it carries well-documented vulnerabilities, particularly concerning the EGR cooling system and turbo actuation. Every rebuilt engine supplied through EnginesMarket includes upgraded internal components addressing these original failure points, backed by a minimum 12-month unlimited mileage warranty.
Why the AJD-V6 Loses Coolant
Affected Vehicles
Jaguar XJ 3.0D (306DT, 2007-2016)
Typical Failure Mileage
70,000 - 110,000 miles
Root Cause
Thermal expansion and exhaust soot buildup cause the internal EGR cooler matrix to fracture, allowing coolant to leak into the intake manifold and combustion chambers, leading to potential hydrolock.
Why It Happens
Thermal expansion and exhaust soot buildup cause the internal EGR cooler matrix to fracture, allowing coolant to leak into the intake manifold and combustion chambers, leading to potential hydrolock.
Dealer (parts + labour)
£1,800-£2,600
Specialist (parts + labour)
£950-£1,300
What it involves
Removing the faulty cooler assembly, fitting an updated JLR-spec unit, and replacing the EGR valve.
Suitability
Viable if caught early before cylinder ingestion; standard maintenance fix.
1 - 2 daysDealer (parts + labour)
£11,000-£15,000
Specialist (parts + labour)
£7,500-£11,000
What it involves
Supply & fit of a fully rebuilt 306DT unit with reinforced internals, updated emissions compatibility, and 12-month warranty.
Suitability
Mandatory if coolant dilution has washed crankcase bearings or caused bent connecting rods.
1 - 2 daysAll 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 |
|---|---|---|---|---|---|
 Minor - EGR Cooler & Valve Replacement Minor | £1,800-£2,600 | £950-£1,300 | Removing the faulty cooler assembly, fitting an updated JLR-spec unit, and replacing the EGR valve. | Viable if caught early before cylinder ingestion; standard maintenance fix. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £11,000-£15,000 | £7,500-£11,000 | Supply & fit of a fully rebuilt 306DT unit with reinforced internals, updated emissions compatibility, and 12-month warranty. | Mandatory if coolant dilution has washed crankcase bearings or caused bent connecting rods. | 1 - 2 days |
Our Recommendation
Our Recommendation
We strongly advise replacing the EGR cooler at the first sign of unexplained coolant loss or white exhaust smoke. Once hydrolock occurs or cylinder walls score, replacement is the only reliable long-term solution for the Jaguar XJ 3.0D. For well-maintained X351 models, a specialist-fitted rebuilt engine is the definitive way to restore the car's flagship grand touring capability.
Don't Let Engine Failure Write Off Your Jaguar XJ 3.0D
Whether you are dealing with EGR cooler leaks or turbo actuator faults on your Jaguar XJ 3.0D, the financial decision between repeated dealership repairs and a complete engine replacement is straightforward. EnginesMarket connects you with trusted UK specialists who supply fully rebuilt AJD-V6 engines featuring upgraded components that permanently address the original design flaws. Every unit comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and optional supply & fit packages, allowing you to bypass main dealer markups and return to the road with confidence.
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 Jaguar XJ 3.0D. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
Jaguar XJ 3.0D Engine ReplacementFrequently Asked Questions
Question 1How much does a Jaguar XJ 3.0D engine replacement cost-
A rebuilt Jaguar XJ 3.0D engine typically costs between £7,500 and £11,000 for supply only, while reconditioned units range from £6,500 to £9,500.
- Specialist supply and fit labour typically adds £910 to £1,170 to the total cost.
- Used 306DT engines are available from £3,500 but carry higher risk of inherited EGR or turbo issues.
- All EngineMarket quotes include a minimum 12-month unlimited mileage warranty coverage.
Question 2What are the most common problems with the Jaguar XJ 3.0D engine-
The most frequent Jaguar XJ 3.0D failures involve EGR cooler internal cracking, turbo actuator sticking, and timing chain tensioner wear. These issues typically emerge between 70,000 and 110,000 miles.
- EGR cooler cracks cause coolant loss and potential hydrolock on diesel variants.
- Turbo wastegate rattle leads to limp mode and loss of boost pressure.
- Early detection of white smoke or coolant loss can prevent catastrophic engine damage.
Question 3Is it worth replacing the engine in a high-mileage Jaguar XJ 3.0D-
Yes, replacing a Jaguar XJ 3.0D engine is often worthwhile if the chassis, suspension and interior remain in good condition. Specialist rebuilt units cost £6,500-£11,000 versus £15,000+ dealer quotes.
- XJ chassis typically exceeds 150,000 miles with proper maintenance and regular servicing.
- Supply and fit options from UK specialists save thousands versus main dealer pricing.
- A 12-month warranty protects your investment against early component failure risks.
Question 4What is the difference between the 306DT and 30DDTX engine codes-
The 306DT is a single-turbo 3.0L V6 diesel producing 207-275hp, fitted to most standard XJ 3.0D variants. The 30DDTX is a sequential twin-turbo evolution producing 296-300hp, reserved for flagship SDV6 and LWB models.
- Both share the same core AJD-V6 architecture and EGR vulnerability profiles.
- The 30DDTX features more complex turbo plumbing and higher-pressure fuel systems.
- Rebuilt pricing is similar, though 30DDTX units require more specialist calibration.
Question 5Do replacement Jaguar XJ 3.0D engines come with a warranty-
Yes, every Jaguar XJ 3.0D replacement engine supplied through EngineMarket includes a minimum 12-month unlimited mileage warranty as standard.
- Coverage typically includes parts and labour for manufacturing defects.
- Warranty validity requires professional fitting and adherence to break-in service intervals.
- Always confirm exact terms, exclusions, and claim process with your chosen UK supplier.
Question 6Will a Land Rover Discovery 3.0 TDV6 engine fit my Jaguar XJ 3.0D-
Jaguar XJ 3.0D engines share core architecture with Range Rover and Discovery V6 units, but ancillary fitment, sump design, and ECU calibration differences mean direct swaps require specialist adaptation.
- Core block, heads, and turbo assembly are interchangeable between JLR applications.
- Mounting points, wiring loom, and cooling system routing differ between XJ and SUV platforms.
- Specialist rebuilders can adapt compatible donor units with XJ-specific ancillaries.
Why Choose UsCompare Jaguar XJ 3.0DEngine PricesToday
100+ Jaguar XJ 3.0D engines supplied through our specialist network
12-Month Warranty on every rebuilt Jaguar XJ 3.0D engine
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