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TDV6 / SDV6 vs 2.5 dCi YD25: which engine is more reliable?

According to our risk index, the TDV6 / SDV6 carries less risk than the 2.5 dCi YD25: 46/100 (moderate risk) versus 59/100 (high risk). The TDV6 / SDV6 has 2 documented serious faults, the main one being «Crankshaft breakage and spinning main bearing shells»; the 2.5 dCi YD25 has 3 documented serious faults, the main one being «Timing chain wear and failure».

Risk index

TDV6 / SDV6

46

Moderate risk · 2 serious faults

Lower risk

Risk index

2.5 dCi YD25

59

High risk · 3 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

10 sourcesHow we work

Is the TDV6 / SDV6 reliable?

The Land Rover and Jaguar TDV6/SDV6 diesel V6 engines, shared with Peugeot and Citroën, have a serious documented fault: crankshaft and main bearing shells on the 3.0, and the belt-driven oil pump on the 2.7. Insist on a service history and weigh up the repair cost before buying.[1][2][3]

See the 3 of the TDV6 / SDV6 faults

Is the 2.5 dCi YD25 reliable?

The 2.5 dCi YD25 in the Navara D40 and Pathfinder R51 is tough, but it has one documented weak point: the lower timing chain, whose failure can destroy the engine. Check its condition, as well as the EGR and the turbo.[4][5][6]

See the 4 of the 2.5 dCi YD25 faults

Side-by-side comparison

Comparison of TDV6 / SDV6 and 2.5 dCi YD25
TDV6 / SDV62.5 dCi YD25
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,720 cm³2,488 cm³
TimingWet belt (belt-in-oil)Chain
Power188–302 hp144–190 hp
Production2004–2018[7]2005–2015[4][8][9]
Reliability
Risk index (what is it?)46Moderate risk59High risk
Documented faults34
Of high or critical severity23
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: Crankshaft breakage and spinning main bearing shells
  2. Critical severity: Broken oil pump housing and timing belt jumping on the 2.7
  3. Medium severity: Turbo and pneumatic actuator failure on the 3.0 TDV6/SDV6
  1. Critical severity: Timing chain wear and failure
  2. High severity: Turbocharger failure
  3. Medium severity: EGR valve clogged with carbon
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 2.7 TDV6 (276DT/DT17, 2004-2010)[3][10]
  • 3.0 TDV6/SDV6 (306DT, 2009-2018)[1][2]
  • 2.5 dCi 144 and 174 hp (YD25DDTi, 2005-2010)[4][5]
  • 2.5 dCi 190 hp (YD25DDTi, 2010-2015)[4][5]
  • 2.5 YD25DDTi 133 hp (Navara D22 / NP300, from 2001)[4][5]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

TDV6 / SDV6

See the 15 models with the TDV6 / SDV6

2.5 dCi YD25

Other comparisons

With the TDV6 / SDV6

With the 2.5 dCi YD25

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Land Rover Discovery TDV6 engine failures making headlinesLandyOnline · Other source · published October 2015 · consulted 5 October 2026
  2. Land Rover & Jaguar SDV6/TDV6 Crankshaft RepairJLR Engines · Technical documentation · consulted 5 October 2026
  3. Land Rover 2.7 TDV6 Timing Belt Replacement GuideBudget Parts (roverparts.eu) · Technical documentation · consulted 5 October 2026
  4. Tips for buying a second-hand pickup: Nissan NavaraFarmers Weekly Interactive · Motoring press · consulted 5 October 2026
  5. YD25 Engine Guide: Specs, Reliability, Problems & Buying TipsAutopartswd · Technical documentation · consulted 5 October 2026
  6. Nissan Navara ProblemeCarwiki.de · Other source · consulted 5 October 2026 · in German
  7. Ford AJD-V6/PSA DT17 engineWikipedia · Other source · consulted 5 October 2026
  8. Nissan YD engineWikipedia · Other source · consulted 5 October 2026
  9. Nissan NavaraWikipedia · Other source · consulted 5 October 2026
  10. TdV6 Timing BeltLes Richmond Automotive (lrautomotive.com.au) · Technical documentation · consulted 5 October 2026