Average Mileage at Engine Failure

Land Rover engines typically fail between 60,000 and 120,000 miles, with the 204DTD Ingenium diesel and 306DT V6 diesel showing the highest enquiry volumes in this range. The 448DT 4.4 TDV8 is the outlier, often exceeding 150,000 miles before failure.

204DTD (Ingenium D): 60,000–120,000 miles [PATTERN DATA] — timing chain tensioner is primary failure point
306DT (TDV6/SDV6): 80,000–140,000 miles [PATTERN DATA] — crankshaft bearing failure is catastrophic
276DT (2.7 TDV6): 80,000–140,000 miles [PATTERN DATA] — oil pump failure often kills the engine
448DT (4.4 TDV8): 100,000–200,000 miles [PATTERN DATA] — considered the most durable Land Rover diesel

Full methodology, the complete per-engine mileage table, and what this means for your ownership below.

Methodology

What this data is, what it isn't, and how to read it correctly.

Source: The mileage figures on this page are derived from the KNOWN FAILURE PATTERNS table in the EM_Proprietary_Data_2025.txt file. This table is triangulated from three proprietary channels: (1) Customer enquiry descriptions (free‑text problem statements submitted with 24,650 quote requests), (2) Supplier quote notes (mechanics listing specific failures when quoting), (3) Post‑sale customer surveys (100+ customers 3‑6 months after replacement). These were then cross‑referenced with manufacturer TSBs (Tier 1) and public forums / Honest John / Parkers (Tier 2) for validation.

What "Typical Mileage Range" means: the range shown is the mileage band within which the most common failure pattern for that engine is reported. It is not a guaranteed failure point — many engines exceed these ranges, and some fail earlier. The data reflects the experience of owners who contacted us for a replacement engine.

What this data cannot tell you: these are qualitative guidance bands, not precise failure rates or percentages. The table does not contain failure rates or percentages — only qualitative patterns. It cannot predict when your specific engine will fail.

Refresh cycle: annually, each February, covering the prior full calendar year. Figures are locked at time of publication and are not silently revised.

For a full breakdown of how we tag and verify every number on this page, see our Data Verification and Editorial Standards pages.

Mileage Data Table

Every Land Rover engine with mileage-at-failure data from the KNOWN FAILURE PATTERNS table, sorted by typical mileage range.

Engine Code	Typical Mileage Range	Primary Failure Pattern	Typical Repair Cost	Severity
204DTD (Ingenium D)	60,000–120,000	Timing chain tensioner failure (early models), oil dilution from DPF regeneration, EGR cooler leaks	Chain: £1,200–£2,500; Full engine: £4,500–£6,500	Immediate
204PT (Ingenium P)	60,000–120,000	Cooling system issues, water pump failure, occasional timing chain stretch	Water pump: £400–£800; Chain: £1,500–£2,500	Monitor
224DT (2.2 Duratorq)	80,000–150,000	EGR cooler leaks, turbo actuator failure, injector seal leaks, timing chain tensioner wear	EGR cooler: £500–£1,200; Full engine: £3,000–£5,000	Monitor
276DT (2.7 TDV6)	80,000–140,000	Oil pump housing failure (weak point at tensioner mount), crankshaft failure, turbo issues	Oil pump: £1,500–£3,000; Full engine: £5,000–£7,500	Catastrophic
306DT (TDV6/SDV6 3.0)	80,000–140,000	Crankshaft bearing failure (tin-aluminium coating fatigue), oil pump issues, turbo contamination	Bottom-end rebuild: £5,500–£7,000; Full reconditioned: £6,500–£9,500	Catastrophic
368DT (3.6 TDV8)	70,000–130,000	Timing chain tensioner failure (early L322, 2006-2009), turbo actuator failure, crankshaft fracture	Chain: £1,500–£3,000; Full engine: £6,000–£9,000	Catastrophic
448DT (4.4 TDV8)	100,000–200,000	Oil cooler leaks (valley of V8), alternator failure, coolant crossover pipe leaks	Oil cooler: £1,200–£2,500	Low
508PS (4.4 SDV8)	100,000–180,000	Generally robust; oil dilution from DPF regeneration (L405), occasional oil cooler issues	Oil cooler: £1,500–£3,000	Low
AJ126 3.0 V6 SC	60,000–120,000	Water pump failure, coolant leaks from crossover pipes, timing chain tensioner wear, supercharger coupler wear	Water pump: £600–£1,200; Supercharger coupler: £500–£1,000	Immediate
AJ133 5.0 V8 SC	60,000–120,000	Timing chain tensioner wear (2009-2012), coolant leaks from crossover pipes, supercharger coupler wear	Chain (pre-2013): £2,500–£4,500	Immediate

All mileage ranges and cost figures [PATTERN DATA] and [EM-QUOTE]. Severity keys: Catastrophic · Immediate · Monitor · Low. Full source detail on the Data Verification page.

What This Data Means For Owners

The mileage ranges above show when Land Rover engines most commonly reach replacement mileage based on our 2025 enquiry data. The single most important takeaway is that the 60,000–120,000 mile window is critical for most modern Land Rover diesel engines. This is when the 204DTD's timing chain tensioner, the 306DT's crankshaft bearing, and the 276DT's oil pump are most likely to fail.

The 448DT 4.4 TDV8 is a clear outlier — it regularly exceeds 150,000 miles before failure, and many examples reach 200,000 miles. This aligns with our Engine Failure Index 2026 finding that the 448DT has the lowest enquiry volume relative to its vehicle parc size.

For owners, these mileage bands are a practical guide for preventative maintenance. If your 204DTD is approaching 100,000 miles, a timing chain tensioner inspection is strongly recommended. If your 306DT or 276DT is approaching 80,000 miles, oil analysis and crankshaft bearing checks are worth investigating. The cost of preventative inspection is small compared to the cost of a full engine replacement.

For a personalised assessment of whether your engine failure is worth repairing, use our Repair vs Replace Calculator. It uses the same underlying cost data to give you a real-world answer based on your vehicle's value.

Failure Patterns by Mileage Band

Understanding when an engine is most vulnerable helps you plan maintenance and avoid catastrophic failure. Here's how the mileage bands break down by engine family:

40,000–80,000 Miles — Early Warning Zone

This is the earliest mileage band where some engines show signs of trouble. The AJ126 supercharged V6 can experience water pump failure and supercharger coupler wear in this range. The AJ133 5.0 V8 is also vulnerable here, particularly for pre-2013 units with timing chain tensioner issues. Early detection and preventative replacement can avoid more extensive damage.

60,000–120,000 Miles — Critical Window

This is the most common failure window for Land Rover engines. The 204DTD Ingenium diesel's timing chain tensioner, the AJ126's cooling system, and the AJ133's timing chain all typically fail in this range. For the 204DTD, early symptoms include cold-start rattle and oil dilution from DPF regeneration. For the AJ126, watch for coolant loss and water pump noise.

80,000–150,000 Miles — High-Mileage Risk

The 306DT and 276DT V6 diesels are most vulnerable in this range. The 306DT's crankshaft bearing failure is often preceded by a cold-start knocking noise, and the 276DT's oil pump failure can kill the engine with little warning. The 224DT 2.2 Duratorq also shows EGR and turbo actuator failures in this range, though these are less catastrophic than the V6 failures.

100,000–200,000 Miles — Durable Engines

The 448DT 4.4 TDV8 and 508PS 4.4 SDV8 are the most durable Land Rover diesel engines. They routinely exceed 150,000 miles and often reach 200,000 miles before any significant failure. The main issues are oil cooler leaks and, for the SDV8, oil dilution from DPF regeneration. Regular oil changes and coolant system maintenance are the key to longevity.

For the full failure pattern details on any engine, see the relevant Failure Page or the Engine Knowledge Centre.

Frequently Asked Questions

What is the average mileage at which Land Rover engines fail?

Most Land Rover diesel engines fail between 60,000 and 120,000 miles. The 204DTD Ingenium diesel and 306DT V6 diesel are the most common failures in this range. The 448DT 4.4 TDV8 is the outlier, often exceeding 150,000 miles.

Which Land Rover engine lasts the longest?

The 448DT 4.4 TDV8 is the most durable Land Rover diesel, with many examples exceeding 150,000 miles and some reaching 200,000 miles. The 508PS 4.4 SDV8 is also robust, though its high replacement cost (£8,000–£12,000) means failures are expensive when they do occur.

Is the mileage data based on real UK vehicles?

Yes. The mileage figures are derived from the KNOWN FAILURE PATTERNS table, which is triangulated from customer enquiry descriptions, supplier quote notes, and post-sale customer surveys, cross-referenced with manufacturer TSBs and public forums.

Can I prevent my engine from failing at these mileages?

Preventative maintenance can significantly reduce the risk. For the 204DTD, 6,000-mile oil intervals and avoiding short urban trips are recommended. For the 306DT, 5,000-mile oil intervals and oil analysis from 80,000 miles are critical. Our Failure Rate by Engine page has more detail on preventative actions.

How does mileage at failure relate to repair cost?

Engines that fail at higher mileages often have less rebuildable material left, increasing replacement costs. However, engines that fail earlier — like the 204DTD at 60,000–80,000 miles — can sometimes be repaired with a timing chain kit rather than a full engine replacement. The Repair, Replace, Scrap Framework page explains the economics in detail.

Where can I find mileage data for non-Land Rover engines?

This page covers Land Rover and Range Rover engines only. For other brands, see our Data & Research hub, or check the specific brand site: bmwengines.uk, mercedesengines.uk, or jaguarengines.uk.

✓

4,935 Real EnquiriesThe full Land Rover-specific dataset behind every figure on this page.

✓

Pattern DataMileage ranges are qualitative guidance, not failure rates.

✓

Annual PublicationRefreshed every February — 2025 is the baseline year.

✓

100% IndependentNo sponsors, no manufacturer influence.

Average Mileage at Engine Failure Land Rover Data