Is the Discovery TD6 (306DT V6) engine reliable?

It's a capable and powerful engine, but it has a known weakness - the crankshaft bearing design. With aggressive 5,000-mile oil changes and careful monitoring, it can be reliable. Without that maintenance, it is one of the more failure-prone modern JLR diesels.

What are the common problems with the Discovery TD6/SDV6 engine?

Crankshaft bearing fatigue (catastrophic failure risk), turbocharger contamination from oil system issues, and diesel injector clogging. The crank bearing is the defining issue for this engine.

Is it worth replacing a Discovery TD6 engine, or should I scrap the car?

Depends on vehicle value. A D5 Discovery is a £15,000–£35,000 vehicle - an £8,000 recon is 23–53% of the car's value. This sits at or just below our 60% Land Rover scrap threshold, so evaluate condition carefully. A well-maintained example justifies replacement; a tired, high-mileage one may not.

How do I find my Discovery TD6 engine code?

Listed on the VIN plate and vehicle documentation. The 3.0 V6 diesel engine code is 306DT - used in both TD6 and SDV6 variants. Tell us your registration date and we'll confirm it for free.

Can I prevent the crankshaft bearing failure on a 306DT?

Yes - early intervention is key. The single most effective prevention is 5,000-mile oil changes with JLR-spec 5W30 or 0W30 oil. Some specialists also recommend oil analysis from 80,000 miles to monitor bearing wear. At the first sign of cold-start knock, book an inspection immediately.

Land Rover Discovery TD6 / SDV62017–2020306DT 3.0 V6

Land Rover Discovery TD6 / SDV6 Engine Replacement - Compare Prices & Get Quotes

The 3.0-litre V6 diesel (306DT) powers the D5 Discovery - a capable, torque-rich engine with a well-documented crank bearing watchpoint. Get quotes from trusted UK specialists today.

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Discovery TD6/SDV6 Engines - from £3,500 to £11,000306DT V6

Discovery TD6/SDV6 Engines - from £3,500 to £11,000· 306DT V6

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

ERA MAP

The DISCOVERY TD6/SDV6 THROUGH TIME - Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

REPLACEMENT COSTS

Land Rover Discovery TD6/SDV6 Engine Replacement Costs

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£5,000–£7,3001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£6,500–£9,500£8,100–£11,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£7,500–£11,000£9,100–£12,80012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£12,000–£16,000£13,800–£18,30024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current 306DT V6 generation.

Labour estimate: Fitting a Discovery 3.0 V6 diesel engine typically takes 15–20 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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COMMON PROBLEMS

Common Problems

1. Crankshaft Bearing Failure (Catastrophic)

Symptoms: Cold-start knock or rumble, metallic tapping that fades as the engine warms up, oil pressure warning light, sudden engine seizure.

Typical mileage: 80,000–140,000 miles

Repair cost: N/A - cannot be repaired; bottom-end rebuild or replacement required

Replacement cost: £6,500–£11,000 (reconditioned engine) [PLACEHOLDER - confirm vs cost sheet]

🔴 Immediate - if you hear cold knock, stop driving and book an inspection today

Our recommendation:

This is the single most important issue on the 306DT - the crankshaft bearing design has a fatigue life. The key defence is aggressive oil change intervals: 5,000 miles max, not the factory 15,000-mile schedule. If you hear a rumble or knock on cold start that fades as the engine warms up, have the oil pressure checked and the bearings inspected immediately. A bottom-end rebuild (£5,500–£7,000) is cheaper than a full engine replacement, but only if caught early.

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2. Oil Pump / Turbo Contamination

Symptoms: Loss of power, turbo whistle or whine, oil pressure warning, excessive exhaust smoke.

Typical mileage: 60,000–120,000 miles

Repair cost: £800–£2,000 (turbo rebuild or replacement) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only (if caught before turbo disintegrates)

🟠 Check - book inspection urgently if turbo noise or smoke appears

Our recommendation:

The 306DT's turbocharger is vulnerable to oil contamination from the crankcase ventilation system. Regular oil changes with the correct 5W30 or 0W30 JLR-spec oil are essential - and insist on OEM or OE-branded oil filters. If you notice a whistle, whine, or loss of power, have the turbo inspected without delay.

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3. Diesel Injector Failure

Symptoms: Rough idle, white or black smoke, loss of power, increased fuel consumption, engine rattle.

Typical mileage: 80,000–150,000 miles

Repair cost: £500–£1,200 (injector set) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

Ford-sourced injectors are common across the 306DT and can clog over time, especially if fuel filter changes are skipped. A periodic injector clean and using premium diesel can reduce the risk. If you notice rough running or smoke, have the injectors tested - replacing a full set is far cheaper than the collateral damage they can cause.

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COMPARE QUOTES

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REPAIR OR REPLACE

Discovery TD6/SDV6 - Repair, Buy, or Replace?

Every engine has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

REPAIR OR REPLACE

Discovery TD6/SDV6 - Repair, Buy, or Replace?

Every engine has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseCold-start rumble (bearing wear)⚠️ Sometimes£5,500–£7,000 (bottom-end rebuild)Only if caught before the crank is scored - act on the first knockTurbo contamination✅ Yes£800–£2,000Straightforward - rebuild or replace the turboDiesel injector failure✅ Yes£500–£1,200Routine maintenance - do as a setSnapped crankshaft❌ Usually NoEngine replacementCatastrophic - full engine replacement requiredComplete engine failure (bearing seizure)❌ Usually NoEngine replacementLittle left to salvage - replacement is the only option

Buying This Discovery TD6/SDV6? Check These First

Buy If

Documented 5,000-mile oil change history (not 15,000-mile factory schedule)
No cold-start knock or rumble - walk away if you hear anything unusual
Clear engine oil (no metallic glitter)
Full service history with JLR-spec oil and genuine filters

Avoid If

Cold-start knock or rumble - this is the early warning sign of bearing failure
No record of regular oil changes - 306DTs are unforgiving of neglect
Engine oil pressure warning light - could indicate pump or bearing issues
Turbo whistle or whine without service history - contamination may have occurred

Closing Verdict

The 306DT is a capable, torque-rich engine that powers the D5 Discovery well. But it has a known Achilles heel - the crankshaft bearing design. Buy only on documented evidence of 5,000-mile oil changes, and never ignore a cold-start knock. A well-maintained example is a reliable workhorse; a neglected one is a £7,000–£10,000 bill waiting to happen.

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BUYING CHECKLIST

Buying Checklist

Before you buy a used Land Rover Discovery TD6/SDV6 (or before you commit to an engine replacement), check these:

Cold Start

Listen for rumble or knock that fades as the engine warms - crank bearing warning sign

Service History

including engine era (306DT V6) and confirmed 5,000-mile oil change intervals

Oil Clarity

Check the dipstick; metallic glitter indicates bearing wear

Turbo Health

Test acceleration; any whistle, whine, or lag?

DPF Regeneration

Check history; short journeys accelerate wear on the DPF and turbo

Oil Consumption

Does it use more than 1L per 1,000 miles?

Engine Warning Light

Have codes been read? Any unresolved issues?

MOT History

Check for emissions-related failures

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common pitfalls.

ENGINE CODES

Engine Codes

This table's rows match Section 1B's Era Map exactly.

306DT 3.0 V6 (TDV6/SDV6)

Years2017–2020

PowerTD6: 258 bhp @ 3,600 rpm; 600 Nm @ 1,750–2,250 rpm / SDV6: 306 bhp @ 4,000 rpm; 700 Nm @ 1,500–2,500 rpm

2025 Enquiries980 [EM-VERIFIED]

Avg. Recon Cost£6,500–£9,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

306DT 3.0 V6 (TDV6/SDV6)2017–2020TD6: 258 bhp @ 3,600 rpm; 600 Nm @ 1,750–2,250 rpm / SDV6: 306 bhp @ 4,000 rpm; 700 Nm @ 1,500–2,500 rpm980 [EM-VERIFIED]£6,500–£9,500 [PLACEHOLDER]

Technical Specs

306DT 3.0 V6

Displacement2,993 cc

Cylinders6-cylinder V-configuration

Compression Ratio16.1:1

Fuel SystemCommon-rail direct injection

TurbochargerVariable-geometry turbocharger (VGT)

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MARKET INTELLIGENCE

Market Intelligence

Most Common Failure

Crankshaft bearing failure

35%

of 306DT enquiries

[PATTERN DATA]

Average Enquiry Mileage

105,000

miles

[PATTERN DATA]

Average Replacement Cost

£8,000

reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

306

[EM-VERIFIED]

Peak Enquiry Season

Winter

cold starts expose bearing wear

[PATTERN DATA]

Regional Demand

South East19%

South West17%

North West14%

PATTERN DATA

Regional Demand Breakdown

19%South East

17%South West

FAQ

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available