Land Rover / 306DT (AJD-V6)
3.0 TD6 V6 Diesel
The Td6 makes its case with low-speed muscle and relaxed cruising. Its compact V6 delivers 254 hp and 440 lb-ft of torque, bringing an easy stride to the Range Rover, Range Rover Sport and Discovery. A single variable-geometry turbo and eight-speed automatic make that pulling power easy to use.
Specifications
Architecture
- Engine code
- 306DT (AJD-V6)
- Layout / mounting
- 60° V6 · longitudinal
- Displacement
- 2,993 cc / 3.0 L
- Bore × stroke
- 84.0 × 90.0 mm
- Compression ratio
- 16.1:1
- Firing order
- 1–4–2–5–3–6
Construction & timing
- Cylinder block
- Compacted graphite iron
- Valvetrain
- DOHC per bank · 24 valves
- Primary cam drive
- Front toothed belt
- Cam-to-cam drive
- Two short timing chains
- High-pressure pump drive
- Separate rear toothed belt
- Piston cooling
- Under-piston oil jets
Fuel, air & control
- Fuel
- Ultra-low-sulfur diesel
- Injection
- Common-rail direct injection
- Turbocharger
- Single variable-geometry
- Turbo cooling
- Water cooled
- ECU family
- Bosch EDC17CP55
- Transmission
- ZF 8-speed automatic
Oil & emissions
- Oil viscosity
- SAE 5W-30
- Oil approval
- STJLR.03.5005
- Reference oil fill*
- 5.9 L · with filter
- Oil pump
- Two-stage design
- EGR
- Low-pressure exhaust recirculation
- Aftertreatment
- DPF · SCR with DEF
*Reference service fill with filter; confirm the model-specific procedure and final oil level.
Vehicles by engine code
| Engine code | Vehicle | Model years | Chassis |
|---|---|---|---|
| 306DT (AJD-V6) | Land Rover Range Rover Td6 | 2016–2021 | L405 |
| Land Rover Range Rover Sport Td6 | 2016–2021 | L494 | |
| Land Rover Discovery Td6 Discovery 5 | 2017–2020 | L462 |
Controller: Bosch EDC17CP55. Match the VIN, engine code and complete ECU hardware/software IDs before replacement or programming. Availability varies by market and trim; the 2021 Range Rover entries are confirmed in Land Rover’s U.S. press kits.
Care & trouble spots
- Oil and intervals. Use the specified approval, not viscosity alone. Follow the VIN-specific service schedule and shorten intervals for frequent short trips, towing, off-road use or extreme temperatures. Investigate rising oil levels or early service warnings.
- Both belts matter. The front belt drives the camshafts; the rear belt drives the high-pressure fuel pump. Replace both at the applicable age or mileage limit and inspect their tensioners. Low mileage does not stop belt ageing.
- Crankshaft and bearings. Land Rover documented main-bearing-shell movement on the 3.0 TDV6. A deep knock, rumble or oil-pressure warning needs immediate attention: stop safely, switch off and arrange recovery. The bulletin does not establish a failure rate.
- Intake, EGR and boost. Deposits, sticking components and leaking intake or charge-air plumbing can cause poor response. Check fault codes, air leaks and actuator operation before cleaning or replacing parts.
- DPF and DEF. Repeated short trips can interrupt filter regeneration. Follow the handbook’s response to exhaust-filter warnings, maintain the DEF level and diagnose SCR or NOx-sensor faults before a restart countdown expires.
- Fuel, cooling and turbo. Keep fuel-filter servicing current and investigate coolant loss or leaks promptly. Warm the engine gently; after sustained heavy work, ease the load before shutdown.
Inspect first; clean as needed. Base intake and EGR cleaning on deposits, symptoms and service history.
References & image credit
| Topic | Sources |
|---|---|
| Design & output | Land Rover: North American Td6 introduction Land Rover: 2020 Discovery brochure |
| Vehicles & model years | Land Rover: 2017 model lineup 2021 Range Rover U.S. press kit 2021 Range Rover Sport U.S. press kit |
| Mechanical data & oil | JLR workshop information: 3.0 TDV6 (reproduced) |
| Maintenance & diagnosis | Land Rover: 2016 service schedules, pp. 35–39 Land Rover SSM72578: crankshaft / bearing concerns Land Rover: DPF and DEF guidance |
Original ECU5 editorial overview. Engine illustration reused from ECU5’s approved image library. Model names identify the vehicles discussed. ECU5 is independent of Jaguar Land Rover. Use current VIN-specific service information for repairs and maintenance.
