2.7‑litre V6 diesel
3.0‑litre V6 diesel
Two generations of Jaguar V6 diesel. The 276DT is the older, more affordable unit; the 306DT brings more power and refinement but carries a well‑known catastrophic risk. Here’s which one fits your driving and budget.
The 306DT is the better engine for most buyers - it offers more power, better refinement, and a more modern driving experience. The 276DT is cheaper to replace and its oil pump failure can be caught early, but the 306DT’s extra performance and widespread availability in newer cars make it the preferred choice for many. For budget‑conscious buyers or those with an older XF or XJ, the 276DT is a viable alternative.
Full comparison, five‑year cost projection, and which engine fits your driving below.
| 276DT (2.7 V6) | 306DT (3.0 V6) | |
|---|---|---|
| Displacement | 2.7‑litre | 3.0‑litre |
| Power | 207–240 PS | 275–300 PS |
| Jaguar Models | XF (X250), XJ (X350, X358) | XF (X250 later), XJ (X351), F‑Pace (early) |
| 2025 UK Enquiries (combined) | 700 [EM‑VERIFIED] | 980 [EM‑VERIFIED] |
| Reconditioned Supply | £5,000–£7,500 | £6,500–£9,500 |
| R&R Labour | 14–18 hrs | 15–20 hrs |
| Defining Failure | Oil pump housing failure | Crankshaft bearing failure |
| Best For | Budget‑conscious, older XF/XJ | Performance, newer XF/XJ, F‑Pace |
Enquiry volumes from 2025 Engine Failure Index. Costs are independent specialist supply‑only; labour adds £65–£75/hr.
The 306DT is the superior engine for most buyers. Its extra power and refinement make a real difference in everyday driving, and it’s found in newer, more desirable Jaguar models. While its crankshaft bearing failure is a well‑known risk, early detection (cold‑start knock) and regular oil changes can mitigate it, and the 306DT’s replacement cost is still within the 60% scrap threshold for most newer vehicles. The 276DT is a good engine, but it’s ageing, its oil pump failure is equally serious, and its lower output makes it less satisfying. For performance and future‑proofing, choose the 306DT; for a cheaper entry into V6 diesel ownership, the 276DT is a viable fallback.
The 276DT is a 2.7‑litre V6 diesel, the first of Jaguar’s modern V6 diesels, used in the XF (X250) and XJ (X350, X358) from around 2007. It produces 207–240 PS and is known for its smooth, torquey delivery. Its main weakness is the oil pump housing failure – a design flaw where the housing cracks, leading to loss of oil pressure and catastrophic engine seizure [PATTERN DATA]. This often occurs between 80,000–140,000 miles. Early warning signs include low oil pressure warnings and a ticking noise from the engine. Replacing the oil pump housing with an updated part can prevent failure, but if ignored, the engine is usually beyond repair. Reconditioned units cost £5,000–£7,500 supply only, plus 14–18 hours of labour. Full details on our 276DT Oil Pump Failure page and 276DT Knowledge Centre.
The 306DT is a 3.0‑litre V6 diesel, an evolution of the 276DT, used in later XF (X250 facelift), XJ (X351), and early F‑Pace models. It produces 275–300 PS and offers a more responsive, refined driving experience. Its Achilles’ heel is the crankshaft bearing failure, typically between 80,000–140,000 miles, which can result in a knocking noise on cold start and, if ignored, total engine destruction [PATTERN DATA]. This is a more catastrophic failure than the 276DT’s oil pump issue, as it often requires a full replacement. Reconditioned units range £6,500–£9,500 supply only, with 15–20 hours labour. Despite the risk, the 306DT is popular due to its performance and the fact that many specialists can now address the bearing issue with preventative oil changes and early detection. See our 306DT Crankshaft Bearing Failure page and 306DT Knowledge Centre.
The 276DT’s strengths are lower cost and simplicity. It’s cheaper to replace – the reconditioned supply cost is roughly £1,500 less than the 306DT, and labour times are similar. The oil pump housing failure, while serious, can be prevented with a relatively inexpensive replacement of the housing (around £1,500–£2,500) before it fails, whereas the 306DT’s bearing failure often requires a full engine strip. The 276DT is also found in older, more affordable XF and XJ models, making it an entry‑point to V6 diesel ownership. For buyers on a tight budget who don’t need the extra power, the 276DT offers a cost‑effective way into Jaguar V6 diesel motoring.
Over a typical 5‑year ownership period, the 276DT is around £1,500–£2,500 cheaper to run than the 306DT, mainly due to lower replacement costs and cheaper parts. However, the 306DT’s newer vehicles often have better fuel economy (thanks to stop‑start and improved technology) and stronger residuals. Servicing costs are similar, though the 306DT’s more complex emissions systems (DPF, AdBlue in later models) can add cost. The probability‑weighted cost of a major failure – factoring in the likelihood and severity – is lower for the 276DT if the oil pump housing is replaced proactively, but many owners don’t do this, making the 306DT’s risk more unpredictable. For a full breakdown, see our engine replacement cost guide.
Choose the 276DT. It’s cheaper to buy and replace, and if you budget for an oil pump housing replacement, it can be a reliable, affordable V6 diesel.
Choose the 306DT. The extra power and refinement are worth the premium, and you’ll enjoy a more modern driving experience. Just maintain it meticulously.
The 276DT is easier to work on and has a simpler design. If you can do your own oil pump housing replacement, it’s a very cost‑effective choice.
Whichever you choose, always apply the repair vs replace framework before committing to a major repair – the 60% scrap threshold applies to both.
Not necessarily. Both have well‑known catastrophic failure modes. The 276DT’s oil pump failure is more preventable with proactive replacement, while the 306DT’s crankshaft bearing failure is harder to predict. Regular maintenance and early detection are key for both.
The 276DT is cheaper to replace – supply costs are £5,000–£7,500 vs £6,500–£9,500 for the 306DT. Labour hours are similar, so the fitted cost is about £1,500–£2,000 less for the 276DT.
If you value performance and plan to keep the car for a while, yes. The 306DT’s extra power and refinement make it a more enjoyable drive. However, if you’re on a tight budget, the 276DT is a good alternative.
Jaguar uses a 60% scrap threshold: if the cost of a replacement engine exceeds 60% of the vehicle’s market value, it’s usually cheaper to scrap the car. We explain this in our repair‑or‑replace framework.
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