The Jaguar 306DT is a 2,993 cc, inline-six, turbocharged diesel engine produced between 2010 and 2015. It features common-rail direct injection, variable geometry turbocharging, and double overhead camshafts, delivering 183 kW (249 PS) and 570 Nm of torque. This engine is part of the Ford-Jaguar Land Rover AJD-V6 programme, designed for strong low-end pull and refined performance in executive vehicles.
Fitted to the XF and XJ models, including the 3.0D variants, the 306DT was engineered for a balance of responsive driving dynamics and fuel efficiency. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 5 compliance across its production run.
One documented technical concern is degradation of the high-pressure fuel pump (HPFP) due to fuel lubricity issues, highlighted in Jaguar Technical Information Service Bulletin JAG-TIS-4510. This issue, primarily affecting vehicles operated with low-sulfur diesel, can lead to fuel delivery faults and engine stalling. From 2013, Jaguar introduced revised pump calibration and updated fuel system diagnostics to improve durability.
Jaguar
Production years 2010–2015 meet Euro 5 emissions standards (EU Regulation (EC) No 715/2007, VCA UK Type Approval #VCA/JAG/306DT/2010).
The Jaguar 306DT is a 2,993 cc inline-six turbo-diesel engineered for executive sedan applications (2010–2015). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver strong low-RPM torque and refined cruising. Designed to meet Euro 5 standards, it balances efficiency with driver engagement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,993 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 183 kW (249 PS) @ 4,000 rpm | |
| Torque | 570 Nm @ 2,000 rpm | |
| Fuel system | Bosch CRS 2000 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Honeywell) | |
| Timing system | Chain-driven dual overhead camshafts | |
| Oil type | SAE 5W-30 C3 (Jaguar Specification TXW-50-001) | |
| Dry weight | 220 kg |
The single VGT turbo provides strong low-RPM torque ideal for urban and highway driving but requires regular highway runs to support DPF regeneration. SAE 5W-30 C3 oil meeting Jaguar TXW-50-001 is critical for turbo and chain lubrication. Short-trip driving leads to incomplete DPF regeneration, increasing backpressure and risk of limp mode. The Bosch CP4 fuel pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 to prevent high-pressure system failure. EGR and SCR systems require periodic inspection; AdBlue levels must be maintained to prevent start-up inhibition. Post-2013 models feature improved HPFP calibration, reducing wear in marginal fuel conditions.
Oil Specs: Requires SAE 5W-30 C3 meeting Jaguar TXW-50-001 (Jaguar SIB JAG-OIL-2011). Supersedes ACEA C3 standards.
Emissions: Euro 5 certification applies to all 2010–2015 models (VCA Type Approval #VCA/JAG/306DT/2010). SCR system required for compliance.
Power Ratings: Measured under ECER 85 standards. Output reflects engine-only test with full exhaust system and emissions controls.
Jaguar Technical Information System (TIS): Docs AJD-ENG-306-001, AJD-ENG-306-003, JAG-TIS-4510
VCA Type Approval Database (VCA/JAG/306DT/2010)
European Regulation (EC) No 715/2007
The Jaguar 306DT was used across Jaguar's XF/XJ platforms with longitudinal mounting and no licensed external applications. This engine received model-specific tuning adjustments-optimized EGR flow on the XJ and revised intake manifolds on the XF-and from 2013 the facelifted XF and XJ models adopted updated fuel pump firmware, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
Locate the engine serial number stamped on the machined pad at the front of the right-hand cylinder block (Jaguar TIS AJD-ID-001). The "306DT" designation is cast into the cylinder head near the cam cover. XF 3.0D models feature a single VGT turbo with black heat shielding; XJ 3.0D units have revised exhaust routing. Critical differentiation from AJ-V8: The 306DT has a 6-cylinder layout and absence of secondary air injection. Service parts require model-year verification—fuel pumps for pre-2013 models are incompatible with post-2013 revisions due to updated lubricity requirements and calibration (Jaguar SIB JAG-FUEL-2013).
The 306DT's primary reliability risk is high-pressure fuel pump wear in vehicles operated with low-quality diesel, with elevated incidence in short-trip usage. Jaguar internal field reports from 2012–2014 noted a significant number of 3.0D models requiring HPFP replacement before 80,000 km, while UK DVSA MOT records show fuel system and emissions faults as frequent causes of advisory notices. Poor fuel quality and infrequent regeneration cycles accelerate wear, making correct diesel selection and regular highway driving critical.
Analysis derived from Jaguar technical bulletins (2010-2015) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR 306DT.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with JAGUAR or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
JAGUAR Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialJAGUAR documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
