The 368DT 3.6 TDV8 generated 650 UK replacement enquiries in 2025 – a significant volume for this early V8 diesel. This page breaks down its failure rate in context, typical mileage at failure, the most common faults, and what it actually costs to fix.
The 368DT 3.6 TDV8 – fitted to Range Rover L322 and early Range Rover Sport L320 – accounted for 650 replacement enquiries in our 2025 UK data [EM-VERIFIED]. It typically fails between 70,000 and 130,000 miles [PATTERN DATA], with timing chain tensioner failure, turbo actuator failure, and crankshaft fracture being the most common problems. A reconditioned supply costs £5,500–£8,000 [EM-QUOTE], and the engine carries a ⚠️ Watch flag on our replacement‑to‑value index – meaning on typical L322 and L320 values (£5k–£18k), the decision is finely balanced and requires careful assessment.
Full context, mileage‑at‑failure distribution, ranked failure modes, and our verdict are below.
How does the 368DT compare to other Land Rover engines in our 2025 enquiry data?
Our 2025 CRM data recorded 4,935 Land Rover‑specific engine enquiries [EM-VERIFIED]. The 368DT contributed 650 of those – about 13% of the total. That places it fourth in the overall Land Rover engine ranking, behind the 204DTD (1,150), 306DT (980), and 276DT (700), but ahead of the 508PS (620), 204PT (480), 224DT (350), and 448DT (320) [EM-VERIFIED].
It is important to read this number in context: the 368DT is the earlier, smaller 3.6-litre TDV8, fitted to the L322 Range Rover and early L320 Range Rover Sport. It was superseded by the more durable 4.4-litre TDV8 (448DT), and the 368DT is now considered the less reliable of the two. Its enquiry volume reflects both the size of the vehicle parc and its known issues – timing chain tensioner failure, crankshaft fracture, and turbo actuator problems.
Unlike the 306DT's crankshaft bearing failure, the 368DT's issues are a mix of timing chain and crankshaft problems, which can be expensive to repair. The engine carries a ⚠️ Watch flag on our R‑to‑V index: on a Range Rover L322 worth £5,000–£18,000, a £5,500–£8,000 replacement cost can be a significant proportion of the vehicle's value. Many owners choose to walk away from a 368DT failure, particularly on lower‑value examples.
For a full ranking, see our Engine Failure Index 2026.
When does the 368DT typically give up?
Our proprietary failure pattern data [PATTERN DATA] indicates that the 368DT most frequently fails in the 70,000–130,000 mile bracket. Within that band, we see two distinct clusters:
These figures are based on customer enquiry descriptions and workshop notes from our specialist network. They are not exact failure rates against the total vehicle population – but they do represent real patterns observed across hundreds of 368DT replacement requests.
Owners who maintain their 368DT with regular oil changes (every 10,000 miles or annually) and have the timing chain tensioner inspected at around 70,000 miles often see the engine exceed 130,000 miles without major internal failures. However, the enquiry data shows that a significant proportion of failures occur before 100,000 miles, suggesting that preventative maintenance is frequently neglected.
For more detailed mileage‑at‑failure data across all engines, see our Average Mileage at Failure page.
Ranked by frequency in our 2025 enquiry data.
The following table lists the top five failure modes we see for the 368DT, based on workshop notes and customer problem descriptions [PATTERN DATA].
| Rank | Failure Mode | Typical Repair Cost (Indie) | Notes |
|---|---|---|---|
| 1 | Timing chain tensioner failure | £1,500–£3,000 | Rattle on cold start; can jump timing if ignored. |
| 2 | Turbo actuator failure | £800–£1,500 | Loss of boost, reduced power, often linked to carbon build‑up. |
| 3 | Crankshaft fracture | £6,000–£9,000 | Catastrophic failure; often requires full engine replacement. |
| 4 | Injector failure | £300–£800 | Leak‑off issues, rough running, black smoke. |
| 5 | EGR cooler / valve issues | £400–£1,200 | Clogging, reduced performance, emissions issues. |
Costs are indicative independent specialist rates; main dealer may be 30‑50% higher. All figures [EM-QUOTE].
The timing chain tensioner is the most common and expensive repair. On pre-2010 368DT engines, the tensioner can wear and cause the chain to jump, leading to catastrophic engine damage. The turbo actuator is also a known weak point – it can fail due to carbon build‑up, causing a loss of boost and reduced performance. Crankshaft fracture is less common but catastrophic – it usually requires a full engine replacement.
If you experience any of these symptoms, our 368DT cold start rattle or turbo whistle pages can help you narrow it down.
Real‑world lifespan based on owner data and workshop feedback.
There is no single answer, but our data and interviews with specialists point to a typical service life of 100,000–140,000 miles for a well‑maintained 368DT [PATTERN DATA]. Engines that have had the timing chain tensioner inspected (particularly on pre-2010 units) and have received regular oil changes (using the correct 5W‑30 spec) tend to exceed 120,000 miles without major internal failures.
Conversely, vehicles that have had irregular servicing – particularly with extended oil change intervals or neglected turbo maintenance – are far more likely to experience timing chain issues and turbo failures before 100,000 miles. The 368DT is a powerful but demanding engine – it does not forgive neglect.
One interesting data point: among the 650 enquiries we logged in 2025, the average declared mileage at the time of enquiry was approximately 95,000 miles – though this is self‑reported and may skew towards higher‑mileage vehicles. For a more rigorous look, we track this in our Engine Lifespan analysis.
If your 368DT is approaching 70,000 miles, we recommend a pre‑emptive timing chain tensioner inspection – the cost of this check is modest compared to a full engine replacement if the chain jumps.
Applying the 60% threshold to the 368DT.
The Land Rover ownership guide uses a 60% replacement‑to‑value (R‑to‑V) threshold: if the cost of a reconditioned engine supply and fit exceeds 60% of the vehicle’s current market value, we consider scrapping or selling as a serious alternative.
For the 368DT, the typical host vehicle values are:
A reconditioned 368DT supply costs £5,500–£8,000 [EM-QUOTE]. Adding labour (14–18 hours at ~£65/hr indie) gives a fitted cost of £6,410–£9,170 for a reconditioned unit.
Worked example: A 2008 Range Rover L322 worth £8,000. Fitted recon cost (mid‑range) = £7,500. That's 94% of the vehicle's value – well above 60%. In this scenario, the engine replacement is not financially sensible; we would advise scrapping or selling for parts.
On a higher‑value example (e.g., a late‑model L322 worth £15,000), the same £7,500 fitted cost represents 50% – comfortably within the 60% threshold, so replacement is justified.
Our ⚠️ Watch flag reflects this: the 368DT can be a good economic choice on higher‑value examples, but is often a write‑off on lower‑value L322s and early L320s. Always use our Repair vs Replace Calculator for your specific vehicle and engine combination.
For a deeper cost breakdown, see our Range Rover engine replacement economics guide.
Most failures occur between 70,000 and 130,000 miles [PATTERN DATA], with timing chain tensioner issues being the most common at the lower end of that range.
Supply‑only prices range from £5,500 to £8,000 [EM-QUOTE]. With labour (14–18 hours), fitted costs are typically £6,410–£9,170 at independent rates.
It is less reliable than the later 4.4 TDV8. Its timing chain tensioner and crankshaft issues are well‑known, and it requires diligent maintenance to reach high mileages. Pre-2010 units are particularly susceptible.
It depends on the vehicle's value. An L322 worth under £8,000 is often not worth replacing – the cost of a recon engine (fitted) frequently exceeds 60% of the vehicle's value. Use our calculator for a personalised answer.
Regular oil changes (10,000 miles or annually) using correct‑spec oil, and a pre‑emptive timing chain tensioner inspection at around 70,000 miles can prevent the most common catastrophic failures. Also, address any turbo actuator issues promptly.
650 Real Enquiries The 368DT‑specific dataset behind every figure on this page.
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