2.4 JTD / JTDm Multijet vs Skyactiv-D: which engine is more reliable?

According to our risk index, the 2.4 JTD / JTDm Multijet carries less risk than the Skyactiv-D: 25/100 (moderate risk) versus 55/100 (high risk). The 2.4 JTD / JTDm Multijet has no documented serious faults; the Skyactiv-D has 3 documented serious faults, the main one being «Oil dilution with diesel during DPF regenerations».

Risk index

2.4 JTD / JTDm Multijet

Moderate risk · 0 serious faults

Lower risk

Risk index

Skyactiv-D

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

Reviewed on 8 October 202622 sources How we work

Is the 2.4 JTD / JTDm Multijet reliable?

The five-cylinder 2.4 JTD/JTDm is powerful but more delicate in its 20V version. Auto Świat says the 10V rarely breaks down on its own; on the 20V, owner testimonies for the 200 and 210 hp Alfa 159 pile up mentions of the EGR and particulate filter, and the 200 hp had the manifold flap failure that Fiat corrected in 2007.^[1][2]

See the 4 of the 2.4 JTD / JTDm Multijet faults

Is the Skyactiv-D reliable?

The Skyactiv-D is a modern and generally reliable diesel, but across its three displacements (1.5, 1.8 and 2.2) it shares oil dilution with diesel fuel during diesel particulate filter regenerations, which means you need to watch the oil level and not stretch oil changes, especially on short journeys; the older 2.2s (2012-2014) also accumulate more turbo and carbon build-up cases.^[3][4][5][6]

See the 4 of the Skyactiv-D faults

Side-by-side comparison

Comparison of 2.4 JTD / JTDm Multijet and Skyactiv-D
Item	2.4 JTD / JTDm Multijet	Skyactiv-D
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,387 cm³	—
Timing	Timing belt (dry)	Chain
Power	136–210 hp	105–184 hp
Production	1998–2011^{[1][7][8][9][10]}	since 2012^[3][11][12]
Reliability
Risk index (what is it?)	25Moderate risk	55High risk
Documented faults	4	4
Of high or critical severity	0	3
Worst severity	Medium severity	Critical severity
Main faults	Medium severity: Intake manifold flap failure (swirl flaps) Medium severity: Clogged or faulty EGR valve on the 2.4 JTD and JTDm Medium severity: Injector failure and diesel leaks on the 2.4 JTDm	High severity: Oil dilution with diesel during DPF regenerations High severity: Turbo wear or failure from lack of lubrication Critical severity: Oil pump chain breakage and camshaft wear
Most expensive documented repair	up to €800Clogged or faulty EGR valve on the 2.4 JTD and JTDmPublished figure^[13]	No reliable data
Which versions to buy
BuyRecommended versions	2.4 JTD 10V (136-150 hp, 1998-2007)^[1][8][14]	None
With cautionVersions to be cautious about	2.4 JTDm / Multijet 20V (175-185 hp, 2003-2009)^[1][14] 2.4 JTDm / Multijet 20V 200 hp (2005-2011)^[1][2] 2.4 JTDm 20V 210 hp (Alfa Romeo, 2007-2010)^{[1][2][15][16]}	2.2 Skyactiv-D 150/175 (SH-VPTS, 2012-2017)^[4][17][18] 2.2 Skyactiv-D 150/175/184 (SH-VPTS, 2017-2021)^[5][19] 1.5 Skyactiv-D 105 (S5-DPTS, 2015-2018)^[6][20] 1.8 Skyactiv-D 116 (S8-DPTS, 2018-present)^[6][21][22]
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

2.4 JTD / JTDm Multijet

See the 7 models with the 2.4 JTD / JTDm Multijet

Skyactiv-D

See the 7 models with the Skyactiv-D

Other comparisons

With the 2.4 JTD / JTDm Multijet

With the Skyactiv-D

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Sources

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

Silnik 2.4 JTD: mocny i trwały, ale czasem też kapryśnyAuto Świat · Motoring press · published 26 September 2011 · consulted 8 October 2026 · in another language
Fiabilité Alfa-romeo 159 (2005-2012) (428 témoignages)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
SkyActivWikipedia (inglés) · Other source · consulted 27 September 2026
Fiabilité Mazda CX-5 (2012-2017)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda 6 (2012-2022)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda CX-3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiat JTD engineWikipedia · Other source · consulted 8 October 2026
Alfa Romeo Brera (guía del taller)The Alfa Workshop · Other source · consulted 8 October 2026
Alfa Romeo 159Wikipedia (alemán) · Other source · consulted 8 October 2026 · in German
SCHAEFFLER - ALFA ROMEO 159 (939_) 2.4 JTDM (939AXD)Rolling Kft. (catálogo) · Technical documentation · consulted 8 October 2026
Mazda CX-5Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda3Wikipedia (inglés) · Other source · consulted 27 September 2026
¿Qué precio tiene cambiar una válvula EGR?RACE (Real Automóvil Club de España) · Other source · published 17 June 2024 · consulted 8 October 2026 · in Spanish
Fiabilité Alfa-romeo 156: pannes par motorisation (2.4 JTD)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
Alfa Romeo 159 2.4 JTD 210 ch 93 000 km (2008, Ti): avis d'un propriétaireFiches-auto.fr · Owners' forum · published 26 January 2013 · consulted 8 October 2026 · in French
Guía de compra del Alfa Romeo 159 de segunda manoDiariomotor · Motoring press · published 9 February 2024 · consulted 8 October 2026 · in Spanish
Aviso a todos los propietarios de Mazda CX-5 Dieselkm77 · Motoring press · published 22 May 2013 · consulted 27 September 2026 · in Spanish
Mazda6Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Fiabilité Mazda CX-5 II (2017-)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda 3 (2013-2019)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda CX-30Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda 3 (2019-)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French