MZR-CD vs 2.5 / 3.0 D-4D (KD): which engine is more reliable?

According to our risk index, the 2.5 / 3.0 D-4D (KD) carries less risk than the MZR-CD: 63/100 versus 64/100 (both high risk). The MZR-CD has 3 documented serious faults, the main one being «Timing chain stretch on the 2.2 MZR-CD»; the 2.5 / 3.0 D-4D (KD) has 3 documented serious faults, the main one being «Cracked pistons in the 3.0 D-4D (1KD-FTV)».

Risk index

MZR-CD

High risk · 3 serious faults

Risk index

2.5 / 3.0 D-4D (KD)

High 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 2 November 202624 sources How we work

Is the MZR-CD reliable?

The MZR-CD is Mazda's most widespread diesel between 2002 and 2013, fitted to the Mazda3, Mazda6, Mazda5 and CX-7. It is sensitive to short journeys: the injector seals and incomplete DPF regenerations can dilute the oil, and the EGR and intake build up carbon. The 2.2-litre redesign (from 2008), with a timing chain instead of a belt, adds the risk of that chain stretching and damaging the engine.^[1][2][3][4]

See the 4 of the MZR-CD faults

Is the 2.5 / 3.0 D-4D (KD) reliable?

Toyota's KD diesels (2.5 D-4D, 2KD-FTV, and 3.0 D-4D, 1KD-FTV) have their best-documented weak points in the injectors: the copper seats of the 2004-2007 units, which can block the oil pickup, and the Denso injectors of the 3.0. The 3.0 of the Euro 4 era also has a record of cracked pistons; for the 2.5 we have only found the injector seal problem.^{[5][6][7][8][9]}

See the 5 of the 2.5 / 3.0 D-4D (KD) faults

Side-by-side comparison

Comparison of MZR-CD and 2.5 / 3.0 D-4D (KD)
Item	MZR-CD	2.5 / 3.0 D-4D (KD)
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	—	—
Timing	Timing belt (dry)	Timing belt (dry)
Power	105–185 hp	102–190 hp
Production	2002–2013^{[10][11][12][13][14]}	since 2000^{[5][15][16][17][18]}
Reliability
Risk index (what is it?)	64High risk	63High risk
Documented faults	4	5
Of high or critical severity	3	3
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Timing chain stretch on the 2.2 MZR-CD High severity: Oil dilution from leaking injector seals and DPF regenerations High severity: Turbocharger wear or failure	Critical severity: Cracked pistons in the 3.0 D-4D (1KD-FTV) Critical severity: Leaking copper injector seats and blocked oil pickup High severity: Denso injector failure in the 3.0 D-4D (blockage and wear)
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	2.0 MZR-CD 121-143 (RF, 2002-2005, no DPF)^[1][3][19] 2.0 MZR-CD 105-143 (RF, 2005-2010, with DPF)^{[1][3][19][20]} 2.2 MZR-CD 125-185 (R2, 2008-2013)^{[2][4][21][22]}	2.5 D-4D 102-120 hp (2KD-FTV, 2005-2011)^[7] 2.5 D-4D 144 hp (2KD-FTV, 2011-2016)^[7][23] 3.0 D-4D 163-166 hp (1KD-FTV, Land Cruiser J120, 2003-2006)^[5][24] 3.0 D-4D 173 hp (1KD-FTV, Euro 4, Land Cruiser J120, 2006-2009)^[5][7][9] 3.0 D-4D 171 hp (1KD-FTV, Hilux, 2005-2016)^[6][23] 3.0 D-4D 190 hp (1KD-FTV, Euro 5, Land Cruiser J150, 2010-2015)^[8][9]
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

MZR-CD

2.5 / 3.0 D-4D (KD)

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Sources

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

Fiabilité Mazda 6 (2002-2008)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité Mazda 6 (2008-2013)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mazda 6 I: Bekannte Probleme und Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Mazda 6 II: Bekannte Probleme und Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Toyota 1KD-FTV 3.0 D-4D: ficha del motor, puntos débiles y fiabilidadMotorReviewer · Technical documentation · consulted 2 November 2026
D4D Toyota HiLux common problems and solutionsUnsealed 4x4 · Motoring press · consulted 2 November 2026
Toyota Hilux (2005 - 2012) used car reviewRAC Drive · Motoring press · published 17 February 2017 · consulted 2 November 2026
Toyota Land Cruiser 150: Gebrauchtwagen-TestAUTO BILD · Motoring press · published 20 January 2020 · consulted 2 November 2026 · in German
1KD-FTV - piston crackToyota-Club.net · Other source · published October 2015 · consulted 2 November 2026
Mazda diesel enginesWikipedia (inglés) · Other source · consulted 27 September 2026
Mazda6Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda3Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda5Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mazda CX-7Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Toyota KD engineWikipedia (inglés) · Other source · consulted 2 November 2026
Allgemeine Daten zum Toyota Hilux Double Cab 3.0 D-4D Life 4x4 (12/11 - 08/14)ADAC Autokatalog · Technical documentation · consulted 2 November 2026 · in German
Allgemeine Daten zum Toyota Hilux Single Cab 2.5 D-4D 4x2 (12/11 - 08/16)ADAC Autokatalog · Technical documentation · consulted 2 November 2026 · in German
Allgemeine Daten zum Toyota Land Cruiser 3.0 D-4D (5-Türer, 01/11 - 10/13)ADAC Autokatalog · Technical documentation · consulted 2 November 2026 · in German
Fiabilité Mazda 3 (2003-2009)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Japanische Zuverlässigkeit? Ärger mit den Dieseln von Mazda und Toyotagebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Fiabilité Mazda 3 (2009-2013)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mazda 3 II (2009-2013): Typische Probleme & Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Vanliga fel: Toyota Hilux (guía de averías comunes)BilKoll · Other source · consulted 2 November 2026 · in another language
Toyota Land Cruiser 125 D4-DAutofácil · Motoring press · published 2 February 2011 · consulted 2 November 2026 · in Spanish