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Skyactiv-G vs 1.2 8v: which engine is more reliable?

According to our risk index, the Skyactiv-G carries less risk than the 1.2 8v: 25/100 versus 36/100 (both moderate risk). The Skyactiv-G has no documented serious faults; the 1.2 8v has 1 documented serious fault, the main one being «Damaged cylinder head gasket (coolant loss and overheating)».

Risk index

Skyactiv-G

25

Moderate risk · 0 serious faults

Lower risk

Risk index

1.2 8v

36

Moderate risk · 1 serious fault

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

15 sourcesHow we work

Is the Skyactiv-G reliable?

The Skyactiv-G is a naturally aspirated petrol engine that the German specialist press consistently describes as reliable, with no documented pattern of serious engine faults in any Mazda model reviewed. Its weak point, shared with almost any direct-injection petrol engine, is carbon build-up in the intake; in addition, 2017-2020 units had recalls for software and for the fuel pump, since fixed by the manufacturer.[1][2][3][4]

See the 5 of the Skyactiv-G faults

Is the 1.2 8v reliable?

The 1.2 8v (D7F) is a simple naturally aspirated engine of 54 to 60 hp, with a timing belt, which Renault fitted from 1996 to the Twingo, Clio II and Kangoo. No catastrophic failures are documented; what owner reviews mention most often are the sensors, the cylinder head gasket, the coil packs and the occasional oil drip.[5][6][7]

See the 5 of the 1.2 8v faults

Side-by-side comparison

Comparison of Skyactiv-G and 1.2 8v
Skyactiv-G1.2 8v
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement—1,149 cm³
TimingChainTiming belt (dry)
Power75–187 hp54–60 hp
Productionsince 2011[1][8]1996–2012[9][10][11][12]
Reliability
Risk index (what is it?)25Moderate risk36Moderate risk
Documented faults55
Of high or critical severity01
Worst severityMedium severityHigh severity
Main faults
  1. Medium severity: Intake shut-off valve software issue and engine stalling
  2. Medium severity: Micro-cracks in the fuel pump impeller
  3. Medium severity: ECU programming and loss of power (CX-5 II and Mazda3 IV)
  1. High severity: Damaged cylinder head gasket (coolant loss and overheating)
  2. Medium severity: Crankshaft sensor (TDC) and other engine sensor failure
  3. Medium severity: Ignition faults: coil packs, ignition harness and humidity
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNone
With cautionVersions to be cautious aboutNone
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

Other comparisons

With the Skyactiv-G

With the 1.2 8v

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. Mazda 3 (BM/BN, 2013-2019) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  3. Mazda 6 (GJ, III) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  4. Mazda CX-5 II (KF) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  5. Fiabilité Renault Clio 2 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  6. Fiabilité Renault Twingo 1993-2006 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  7. Fiabilité Renault Twingo 2 (2007-2014) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  8. List of Mazda enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  9. Moteur D (Renault)Wikipédia (francés) · Other source · consulted 2 November 2026 · in French
  10. Renault Clio IIWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  11. Renault TwingoWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  12. Renault Twingo IWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  13. Mazda 2 (DJ) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  14. Mazda 3 IV (BP) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  15. Renault Twingo (ab 1993): Schwachstellen laut TÜV-AuswertungAUTO BILD · Motoring press · published February 2002 · consulted 2 November 2026 · in German