"The 306DT is one of Land Rover's most capable diesels, but sinking money into repairs is a recurring theme for owners."
RISKY
52/ 100
"Capable diesel, expensive when it breaks"
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Max HP
—
Torque Nm
10,000
Oil interval km
0
Recalls
6
Known issues
Known Issues
Timing Chain Wear and Rattle€2,000-4,500 · 100,000-180,000 kmCRITICAL
The 306DT shares its lineage with earlier TDV6 engines notorious for timing chain slack and rattle on cold start. The chain tensioner can fail to take up slack quickly enough, especially on cold starts, leading to chain wear and potential engine damage if ignored. This is an interference engine, making chain failure catastrophic.
Rattling or ticking noise on cold start
Ticking that disappears after warm-up
Check engine light with camshaft timing codes
Rough idle on startup
DIY: Expert only
EGR Valve and Cooler Failure€600-1,800 · 80,000-160,000 kmHIGH
The EGR system on the 306DT is known to coke up heavily over time, leading to EGR valve sticking or failure and potential EGR cooler leaks. A leaking EGR cooler can allow coolant into the intake manifold, risking serious engine damage. This issue is common across Land Rover diesel engines of this era.
Loss of power
Increased smoke from exhaust
Check engine light with EGR-related codes
Rough idle
Coolant loss without visible external leak
DIY: Moderate
Air Suspension System Failures€800-2,500 · 60,000-130,000 kmHIGH
The L462 Discovery 5 uses an air suspension system that is a known reliability weak point. Compressor failures, air strut leaks, and valve block faults are frequently reported, with vehicles dropping to bump stops overnight. Repair costs are significant and recurring.
Vehicle sitting lower on one or more corners
Air suspension warning light
Compressor running continuously
Rough ride quality
Vehicle on bump stops after overnight park
DIY: Moderate to Expert
Electrical Gremlins and Terrain Response Faults€200-1,200 · 50,000-120,000 kmMODERATE
Land Rover's complex electronics on the L462 platform are prone to random fault codes, including Terrain Response faults and various module communication errors. These may not always indicate a mechanical failure but require dealer-level diagnostic equipment to resolve.
Like most modern diesel engines, the 306DT's DPF is susceptible to blockage, particularly if the vehicle is used predominantly for short urban journeys that prevent active regeneration from completing. A blocked DPF can cause limp mode and, if neglected, require full replacement.
DPF warning light
Loss of power or limp mode
Excessive black smoke
Increased fuel consumption
Engine running rough
DIY: Low (forced regen) / Moderate (removal for cleaning)
Propshaft and Drivetrain Wear€300-900 · 120,000-200,000 kmLOW
At higher mileages, propshaft universal joints and centre bearings can wear, producing vibration or clunking under load. Mentioned in community data for related Land Rover diesel platforms at high mileage.
Vibration under acceleration
Clunking from driveline
Noise when engaging 4WD
DIY: Moderate
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Buying Checklist
Cold-start the engine and listen for any timing chain rattle or ticking that fades after warm-up
Perform a full OBD scan with Land Rover-specific diagnostics (IIDTool or equivalent) to check for stored fault codes across all modules
Check the vehicle's ride height on all four corners before and after a test drive to assess air suspension health
Request full documented service history showing oil changes at or below 10,000 km intervals with correct 0W-30/5W-30 STJLR-spec oil
Inspect the EGR cooler area and intake manifold for signs of coolant residue or excessive soot/oil deposits
Ask the seller about typical usage pattern — avoid any example used primarily for short urban journeys due to DPF blockage risk
Service Reality
Community oil interval10,000 km
Oil specification0W-30 or 5W-30 meeting Land Rover STJLR.03.5003 specification (e.g., Castrol Edge 0W-30 or equivalent)
Est. ownership cost (2yr)€1,500–€3,500 per year depending on mileage, with potential for €3,000–€6,000+ major repair events for timing chain or air suspension overhaul
Real fuel consumptionNo data
Also Found In
Land Rover Range Rover Sport (L494) 3.0 TDV6/SDV6Land Rover Range Rover (L405) 3.0 TDV6/SDV6Land Rover Discovery 4 (L319) 3.0 TDV6Jaguar F-Pace 3.0dJaguar XF 3.0dJaguar XJ 3.0d
Buying Advice
The Discovery 5 306DT is a capable and refined diesel that can deliver high mileage reliability, but only with a verifiable and meticulous service history using correct oil specifications. Budget realistically for air suspension and potential timing chain work within the first year of ownership, as these are not if but when expenses on neglected examples. Independent Land Rover specialists are strongly recommended over main dealers for ongoing maintenance to keep costs manageable. Avoid any example without documented service history, with air suspension warning lights present, or that exhibits a cold-start timing chain rattle — these are expensive problems that compound quickly.