TDV6 / SDV6 vs 1.7 CDTI: which engine is more reliable?

According to our risk index, the 1.7 CDTI carries less risk than the TDV6 / SDV6: 36/100 versus 46/100 (both moderate risk). The TDV6 / SDV6 has 2 documented serious faults, the main one being «Crankshaft breakage and spinning main bearing shells»; the 1.7 CDTI has 3 documented serious faults, the main one being «Dual-mass flywheel and clutch wear».

Risk index

TDV6 / SDV6

Moderate risk · 2 serious faults

Risk index

1.7 CDTI

Moderate risk · 3 serious faults

Lower risk

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

Reviewed on 5 October 202614 sources How 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 1.7 CDTI reliable?

The 1.7 CDTI (Isuzu, 2003-2015) is a simple, widely used diesel, but it has built up accounts of soot-fouled EGR valves and injectors, a clogged diesel particulate filter (DPF) with oil dilution, wear of the dual-mass flywheel and clutch, and of the Hitachi-brand alternator; it also requires the timing belt to be changed every 150,000 km or 6 years to avoid a serious failure.^{[4][5][6][7][8][9][10]}

See the 5 of the 1.7 CDTI faults

Side-by-side comparison

Comparison of TDV6 / SDV6 and 1.7 CDTI
Item	TDV6 / SDV6	1.7 CDTI
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,720 cm³	1,686 cm³
Timing	Wet belt (belt-in-oil)	Timing belt (dry)
Power	188–302 hp	100–130 hp
Production	2004–2018^[11]	2003–2015^[4][12][13]
Reliability
Risk index (what is it?)	46Moderate risk	36Moderate risk
Documented faults	3	5
Of high or critical severity	2	3
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Crankshaft breakage and spinning main bearing shells Critical severity: Broken oil pump housing and timing belt jumping on the 2.7 Medium severity: Turbo and pneumatic actuator failure on the 3.0 TDV6/SDV6	High severity: Dual-mass flywheel and clutch wear High severity: Clogged diesel particulate filter (DPF) and oil dilution Critical severity: Timing belt: risk of serious failure if not changed on time
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	2.7 TDV6 (276DT/DT17, 2004-2010)^[3][14] 3.0 TDV6/SDV6 (306DT, 2009-2018)^[1][2]	1.7 CDTI 100-101 hp (Z17DTH, 2003-2007)^[9][10] 1.7 CDTI 110 hp (Z17DTJ/A17DTJ/A17DTC/A17DTE, 2007-2014)^[9][10] 1.7 CDTI 125 hp (Z17DTR/A17DTR, 2006-2013)^[5][6] 1.7 CDTI 130 hp (A17DTS, 2010-2015)^[9][10]
AvoidVersions to avoid	None	None

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 14 models with the TDV6 / SDV6

1.7 CDTI

See the 7 models with the 1.7 CDTI

Other comparisons

With the TDV6 / SDV6

With the 1.7 CDTI

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.

Land Rover Discovery TDV6 engine failures making headlinesLandyOnline · Other source · published October 2015 · consulted 5 October 2026
Land Rover & Jaguar SDV6/TDV6 Crankshaft RepairJLR Engines · Technical documentation · consulted 5 October 2026
Land Rover 2.7 TDV6 Timing Belt Replacement GuideBudget Parts (roverparts.eu) · Technical documentation · consulted 5 October 2026
Circle L engineWikipedia (inglés) · Other source · consulted 27 September 2026
Essai complet Opel Astra (H) : fiabilité et avisFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Essai complet Opel Zafira 2 : fiabilité et avisFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Essai complet Opel Meriva : fiabilité et avisFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Opel Astra H (A04): Probleme & KaufberatungGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
Opel Meriva A: ProblemeGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
Opel Meriva B: ProblemeGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
Ford AJD-V6/PSA DT17 engineWikipedia · Other source · consulted 5 October 2026
Opel Corsa DWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Opel MerivaWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
TdV6 Timing BeltLes Richmond Automotive (lrautomotive.com.au) · Technical documentation · consulted 5 October 2026