The 306DT (3.0‑litre TDV6/SDV6) is a shared engine with Land Rover, generating 980 UK enquiries in 2025. This page examines its failure patterns, typical mileage, and cost data for Jaguar applications.
The 306DT is a 3.0‑litre V6 diesel used across the Jaguar XF, XJ and F‑Pace, as well as many Land Rovers. In our 2025 data, it generated 980 combined enquiries across both brands, with Jaguar‑specific models accounting for a significant share. Typical failures occur between 80,000 and 140,000 miles, with crankshaft bearing failure being the most common catastrophic issue. Reconditioned supply costs range from £6,500 to £9,500, but the high value of typical Jaguar hosts means replacement is almost always financially sound.
Full breakdown below - including how the 306DT compares to other Jaguar engines, and what you can do to avoid a costly failure.
How the 306DT compares to other Jaguar engines in real enquiry data.
The 306DT (also known as the 3.0‑litre TDV6 and SDV6) is a Ford‑derived V6 diesel that was extensively used by Jaguar Land Rover. In our 2025 data, it generated 980 unique quote requests across both Land Rover and Jaguar models [EM-VERIFIED]. That makes it the fifth most‑enquired engine in our entire dataset, and the second most‑enquired Land Rover‑derived unit after the 204DTD.
For Jaguar specifically, the 306DT is fitted to the XF (X250, X260), XJ (X351) and F‑Pace (X761) - all models that appear in our top model enquiry list. While the total 980 figure includes Land Rover applications, we can infer a significant Jaguar share from model‑level data:
| Jaguar Model | 2025 Enquiries (all engines) | Typical 306DT Fitment |
|---|---|---|
| XF X260 | 276 [EM‑VERIFIED] | 30d, 3.0D |
| XJ X351 | 151 [EM‑VERIFIED] | 3.0D |
| F‑Pace X761 | 220 [EM‑VERIFIED] | D300, 3.0D |
Model‑level figures [EM-VERIFIED] from 2025 UK CRM data.
As always, enquiry volume is not the same as failure rate. The 306DT’s high count reflects its widespread use across premium SUVs and saloons, as well as its age profile - many examples are now entering the typical failure mileage band. However, the pattern of failures reported by specialists confirms that the engine does have a genuine weak point: the crankshaft bearing.
For a full view of how all engines compare, see our Engine Failure Index 2026.
At what mileage do 306DT owners typically report problems?
Based on our [PATTERN DATA] from specialist interviews and owner surveys, the 306DT shows a clear mileage‑related pattern. The majority of enquiries and reported failures fall into three bands:
Importantly, the 306DT's bearing failure is often sudden and without extensive prior warning - unlike timing chain issues that give a rattling noise for weeks. This makes regular oil analysis and early diagnosis critical. Many specialists recommend an oil pressure test at 80k miles to catch any degradation.
For a deeper dive into the data behind these mileage bands, see our Average Mileage at Failure page.
Ranked by cost and severity - from the most common to the most expensive.
| Rank | Failure Mode | Typical Mileage | Repair Cost (Indie) | Severity |
|---|---|---|---|---|
| 1 | Crankshaft bearing failure | 80k–140k | Bottom‑end rebuild: £5,500–£7,000 Full recon: £6,500–£9,500 |
Catastrophic |
| 2 | Turbocharger failure | 90k–150k | £1,200–£2,500 | Immediate |
| 3 | EGR valve / cooler issues | 80k–120k | £500–£1,200 | Monitor |
All cost ranges [EM-QUOTE] based on supplier quotes and specialist interviews. Severity scale: Catastrophic / Immediate / Monitor.
The crankshaft bearing failure is the most critical and costly. It is caused by fatigue of the tin‑aluminium bearing coating, often exacerbated by oil degradation or contamination. A cold‑start knock is the classic early warning - ignoring it can lead to a seized engine and a full replacement. Our full crankshaft bearing failure guide explains the diagnosis and repair process in detail.
Turbocharger failure and EGR issues are less catastrophic but still expensive. Regular servicing with the correct oil specification (Jaguar recommends 5W‑30) and avoiding excessive idling can help extend turbo life.
Real‑world lifespan of the 306DT - and what makes the difference.
With proper maintenance, the 306DT is capable of 150,000–200,000 miles of reliable service [EM-INTERVIEW]. Many examples on UK roads have exceeded this, particularly those in Jaguar saloons and SUVs that are predominantly motorway‑driven.
The key to longevity is oil changes at 5,000–6,000 mile intervals (significantly shorter than the manufacturer's extended schedule), using a high‑quality 5W‑30 or 5W‑40 oil that meets JLR spec. Frequent short trips and towing heavy loads (more common in Land Rover applications) increase bearing stress, so Jaguar owners may have a slight advantage here.
Early detection of bearing wear is crucial. Specialists recommend an oil analysis at 80k miles to check for elevated levels of copper, tin and aluminium - the materials used in the bearing coating. A simple oil pressure test can also reveal if the bearing clearances are increasing.
For a more detailed analysis of engine longevity across the range, see our Engine Lifespan page.
A balanced assessment of the 306DT's reliability and value.
Reliability rating: 3 / 5 (provisional)
The 306DT is a powerful, torquey V6 diesel that delivers strong performance in the XF, XJ and F‑Pace. However, its reputation is marred by the crankshaft bearing failure, which can be sudden and expensive. With proactive maintenance - particularly shortened oil change intervals and early oil analysis - it can still provide a long, trouble‑free life.
Our advice: If you're buying used, prioritise a car with a documented service history and evidence of regular oil changes. Consider having an oil analysis performed as part of the pre‑purchase inspection. If you already own a 306DT, budget for an oil pressure test at 80k miles and be alert to any cold‑start knocking.
[PROVISIONAL] This rating will be updated once the official 306DT Engine Knowledge Centre is published.
The 306DT is a 3.0‑litre V6 diesel engine, also known as the TDV6 or SDV6. It appears in the Jaguar XF (X250, X260), XJ (X351), F‑Pace, and previously in the XF Sportbrake. It is also widely used in Land Rovers such as the Discovery and Range Rover.
It has a mixed reputation. The crankshaft bearing failure is a well‑known weak point, particularly on higher‑mileage units. However, with diligent maintenance - especially frequent oil changes - many examples exceed 150,000 miles without major issues.
The most common early warning is a knocking or rattling noise from the engine on cold start, which may fade as the engine warms up. As wear progresses, the knock becomes louder and more persistent, and oil pressure may drop. Catastrophic failure can occur without much warning.
A reconditioned engine supply costs £6,500–£9,500, with fitting labour adding £975–£1,300 at independent rates. Main dealer costs are significantly higher. A bottom‑end rebuild may be cheaper if caught early, but full replacement is often the most reliable option.
With proper care, many 306DT engines exceed 150,000 miles. Some well‑maintained examples have reached 200,000 miles. However, the bearing failure risk increases after 80,000 miles, so proactive monitoring is essential.
980 Real Enquiries The 2025 data behind this page, combining Land Rover and Jaguar owners.
Limitations Disclosed Enquiry volume ≠ failure rate - we explain what the data can and cannot tell you.
Independence No manufacturer affiliation; no sponsored content.
Specialist‑Sourced All failure patterns and costs are verified with UK engine specialists.
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