TDV6 / SDV6 vs 2.0 CDI (OM640): which engine is more reliable?

According to our risk index, the 2.0 CDI (OM640) 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 2.0 CDI (OM640) has 2 documented serious faults, the main one being «Costly failure of the Autotronic (CVT) automatic gearbox».

Risk index

TDV6 / SDV6

Moderate risk · 2 serious faults

Risk index

2.0 CDI (OM640)

Moderate risk · 2 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 202612 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 2.0 CDI (OM640) reliable?

The OM640 is the 2.0 CDI four-cylinder diesel that Mercedes-Benz fitted between 2004 and 2012 to the A-Class (W169) and B-Class (W245), with outputs from 82 to 140 hp (160/180/200 CDI). Its mechanical base is considered reliable, with the EGR valve and the injectors being typical weak points of diesels of that era; the problem owners cite most, however, is the Autotronic (CVT) automatic gearbox, optional on the 180 CDI and 200 CDI.^[4][5][6][7]

See the 4 of the 2.0 CDI (OM640) faults

Side-by-side comparison

Comparison of TDV6 / SDV6 and 2.0 CDI (OM640)
Item	TDV6 / SDV6	2.0 CDI (OM640)
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,720 cm³	1,991 cm³
Timing	Wet belt (belt-in-oil)	Chain
Power	188–302 hp	82–140 hp
Production	2004–2018^[8]	2004–2012^{[4][9][10][11]}
Reliability
Risk index (what is it?)	46Moderate risk	36Moderate risk
Documented faults	3	4
Of high or critical severity	2	2
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	Critical severity: Costly failure of the Autotronic (CVT) automatic gearbox High severity: Premature turbocharger wear or failure Medium severity: EGR valve clogged with soot
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][12] 3.0 TDV6/SDV6 (306DT, 2009-2018)^[1][2]	160 CDI (60 kW/82 hp, A-Class only)^[5][10] 180 CDI (80 kW/109 hp)^[5][6] 200 CDI (103 kW/140 hp)^[5][7]
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

2.0 CDI (OM640)

Other comparisons

With the TDV6 / SDV6

With the 2.0 CDI (OM640)

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
Mercedes-Benz OM 640Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes A-Klasse (W169) – Typische Probleme & SchwachstellenGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
Fiabilité des 180d / 180 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité 200 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Ford AJD-V6/PSA DT17 engineWikipedia · Other source · consulted 5 October 2026
Mercedes-Benz OM640 engineWikipedia · Other source · consulted 27 September 2026
Mercedes-Benz W169Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes-Benz W245Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
TdV6 Timing BeltLes Richmond Automotive (lrautomotive.com.au) · Technical documentation · consulted 5 October 2026