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

According to our risk index, the Skyactiv-D carries less risk than the 2.5 / 3.0 D-4D (KD): 55/100 versus 63/100 (both high risk). The Skyactiv-D has 3 documented serious faults, the main one being «Oil dilution with diesel during DPF regenerations»; 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

Skyactiv-D

55

High risk · 3 serious faults

Lower risk

Risk index

2.5 / 3.0 D-4D (KD)

63

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

23 sourcesHow we work

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.[1][2][3][4]

See the 4 of the Skyactiv-D 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 Skyactiv-D and 2.5 / 3.0 D-4D (KD)
Skyactiv-D2.5 / 3.0 D-4D (KD)
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement——
TimingChainTiming belt (dry)
Power105–184 hp102–190 hp
Productionsince 2012[1][10][11]since 2000[5][12][13][14][15]
Reliability
Risk index (what is it?)55High risk63High risk
Documented faults45
Of high or critical severity33
Worst severityCritical severityCritical severity
Main faults
  1. High severity: Oil dilution with diesel during DPF regenerations
  2. High severity: Turbo wear or failure from lack of lubrication
  3. Critical severity: Oil pump chain breakage and camshaft wear
  1. Critical severity: Cracked pistons in the 3.0 D-4D (1KD-FTV)
  2. Critical severity: Leaking copper injector seats and blocked oil pickup
  3. High severity: Denso injector failure in the 3.0 D-4D (blockage and wear)
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 2.2 Skyactiv-D 150/175 (SH-VPTS, 2012-2017)[2][16][17]
  • 2.2 Skyactiv-D 150/175/184 (SH-VPTS, 2017-2021)[3][18]
  • 1.5 Skyactiv-D 105 (S5-DPTS, 2015-2018)[4][19]
  • 1.8 Skyactiv-D 116 (S8-DPTS, 2018-present)[4][20][21]
  • 2.5 D-4D 102-120 hp (2KD-FTV, 2005-2011)[7]
  • 2.5 D-4D 144 hp (2KD-FTV, 2011-2016)[7][22]
  • 3.0 D-4D 163-166 hp (1KD-FTV, Land Cruiser J120, 2003-2006)[5][23]
  • 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][22]
  • 3.0 D-4D 190 hp (1KD-FTV, Euro 5, Land Cruiser J150, 2010-2015)[8][9]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

Skyactiv-D

See the 7 models with the Skyactiv-D

2.5 / 3.0 D-4D (KD)

Other comparisons

With the Skyactiv-D

With the 2.5 / 3.0 D-4D (KD)

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.

  1. SkyActivWikipedia (inglés) · Other source · consulted 27 September 2026
  2. Fiabilité Mazda CX-5 (2012-2017)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiabilité Mazda 6 (2012-2022)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiabilité Mazda CX-3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Toyota 1KD-FTV 3.0 D-4D: ficha del motor, puntos débiles y fiabilidadMotorReviewer · Technical documentation · consulted 2 November 2026
  6. D4D Toyota HiLux common problems and solutionsUnsealed 4x4 · Motoring press · consulted 2 November 2026
  7. Toyota Hilux (2005 - 2012) used car reviewRAC Drive · Motoring press · published 17 February 2017 · consulted 2 November 2026
  8. Toyota Land Cruiser 150: Gebrauchtwagen-TestAUTO BILD · Motoring press · published 20 January 2020 · consulted 2 November 2026 · in German
  9. 1KD-FTV - piston crackToyota-Club.net · Other source · published October 2015 · consulted 2 November 2026
  10. Mazda CX-5Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  11. Mazda3Wikipedia (inglés) · Other source · consulted 27 September 2026
  12. Toyota KD engineWikipedia (inglés) · Other source · consulted 2 November 2026
  13. 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
  14. 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
  15. 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
  16. Aviso a todos los propietarios de Mazda CX-5 Dieselkm77 · Motoring press · published 22 May 2013 · consulted 27 September 2026 · in Spanish
  17. Mazda6Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  18. Fiabilité Mazda CX-5 II (2017-)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  19. Fiabilité Mazda 3 (2013-2019)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  20. Fiabilité Mazda CX-30Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  21. Fiabilité Mazda 3 (2019-)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  22. Vanliga fel: Toyota Hilux (guía de averías comunes)BilKoll · Other source · consulted 2 November 2026 · in another language
  23. Toyota Land Cruiser 125 D4-DAutofácil · Motoring press · published 2 February 2011 · consulted 2 November 2026 · in Spanish