e-Skyactiv D 3.3 vs 2.0 CDI (OM640): which engine is more reliable?

According to our risk index, the e-Skyactiv D 3.3 carries less risk than the 2.0 CDI (OM640): 21/100 (low risk) versus 36/100 (moderate risk). The e-Skyactiv D 3.3 has 2 documented serious faults, the main one being «Stalling and restart failures due to control unit software»; the 2.0 CDI (OM640) has 2 documented serious faults, the main one being «Costly failure of the Autotronic (CVT) automatic gearbox».

Risk index

e-Skyactiv D 3.3

Low risk · 2 serious faults

Lower risk

Risk index

2.0 CDI (OM640)

Moderate risk · 2 serious faults

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

Reviewed on 30 October 202612 sources How we work

Is the e-Skyactiv D 3.3 reliable?

The e-Skyactiv D 3.3 is an inline-six diesel with mild-hybrid assistance that Mazda debuted in the CX-60. It is a very recent engine: there is no in-service reliability data, and what is documented are software recalls (stalling, restarting, clutch) fixed at the official dealer.^[1][2][3]

See the 2 of the e-Skyactiv D 3.3 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 e-Skyactiv D 3.3 and 2.0 CDI (OM640)
Item	e-Skyactiv D 3.3	2.0 CDI (OM640)
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	3,283 cm³	1,991 cm³
Timing	—	Chain
Power	254 hp	82–140 hp
Production	since 2022^[8][9]	2004–2012^{[4][10][11][12]}
Reliability
Risk index (what is it?)	21Low risk	36Moderate risk
Documented faults	2	4
Of high or critical severity	2	2
Worst severity	High severity	Critical severity
Main faults	High severity: Stalling and restart failures due to control unit software High severity: Clutch between engine and electric motor that does not re-engage after braking	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	3.3 e-Skyactiv D 254 (T3-VPTS, 2022-present)^[1][2][3]	160 CDI (60 kW/82 hp, A-Class only)^[5][11] 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

e-Skyactiv D 3.3

Mazda CX-60

2.0 CDI (OM640)

Other comparisons

With the e-Skyactiv D 3.3

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.

DVSA – base de llamadas a revisión (Mazda CX-60)DVSA (Reino Unido) · Official body · consulted 29 October 2026
Mazda CX-60 (2022 – 2024): engine stall (Safety Gate SR/01913/25)Car-Recalls.eu · Official body · published 23 May 2025 · consulted 29 October 2026
Mazda CX-60: The engine not responding to the accelerator after stopping (KBA 14131R)Car-Recalls.eu · Official body · published 11 August 2025 · consulted 29 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
Skyactiv (apartado Skyactiv-D 3.3)Wikipedia (inglés) · Other source · consulted 29 October 2026
Mazda CX-60 3.3 e-Skyactiv D MHEV 254ps AWD HomuraPractical Caravan · Motoring press · consulted 29 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