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1.0 EcoBoost vs 2.3 MZR DISI Turbo: which engine is more reliable?

According to our risk index, the 2.3 MZR DISI Turbo carries less risk than the 1.0 EcoBoost: 63/100 versus 71/100 (both high risk). The 1.0 EcoBoost has 3 documented serious faults, the main one being «Degradation of the timing belt running in oil»; the 2.3 MZR DISI Turbo has 2 documented serious faults, the main one being «Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo».

Risk index

1.0 EcoBoost

71

High risk · 3 serious faults

Risk index

2.3 MZR DISI Turbo

63

High risk · 2 serious faults

Lower risk

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 1.0 EcoBoost reliable?

It is a turbocharged direct-injection three-cylinder that has won Engine of the Year several times, but it has two very well-documented weak points: two belts running in oil (timing and oil pump) that can disintegrate and seize the engine, and cases of coolant leaks and overheating in early units. It is best bought with a service history and the belts checked or replaced on time.[1][2][3][4]

See the 4 of the 1.0 EcoBoost faults

Is the 2.3 MZR DISI Turbo reliable?

Mazda's 2.3 DISI Turbo (L3-VDT, 2005-2013) is powerful but demanding: the timing chain, the turbo and oil sludge are its weak points; only buy one with a good oil service history.[5][6][7]

See the 3 of the 2.3 MZR DISI Turbo faults

Side-by-side comparison

Comparison of 1.0 EcoBoost and 2.3 MZR DISI Turbo
1.0 EcoBoost2.3 MZR DISI Turbo
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement999 cm³2,261 cm³
TimingWet belt (belt-in-oil)Chain
Power100–155 hp256–263 hp
Productionsince 2012[1][8][9][10]2005–2013[5][11]
Reliability
Risk index (what is it?)71High risk63High risk
Documented faults43
Of high or critical severity32
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: Degradation of the timing belt running in oil
  2. Critical severity: Oil pump belt and tensioner failure
  3. Critical severity: Coolant leaks and overheating from the turbo hose
  1. Critical severity: Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo
  2. High severity: Premature turbocharger wear from poor lubrication on the 2.3 DISI Turbo
  3. Medium severity: Oil consumption and sludge in the 2.3 DISI Turbo engine
Most expensive documented repairup to €1,200Degradation of the timing belt running in oilPublished figure[2]up to €2,200Premature turbocharger wear from poor lubrication on the 2.3 DISI TurboPublished figure[6]
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 1.0 EcoBoost 100/125 (Fox, 2012-2017)[2][3][12]
  • 1.0 EcoBoost 100/125/140 with cylinder deactivation (from ~2017)[13][14]
  • 1.0 EcoBoost Hybrid 48V mild hybrid (125/155 hp, from 2019)[1][15]
  • 2.3 MZR DISI Turbo 256-260 hp (L3-VDT, 2005-2009)[5][6]
  • 2.3 MZR DISI Turbo (L3-VDT, 2010-2013)[5][6]
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

1.0 EcoBoost

See the 12 models with the 1.0 EcoBoost

2.3 MZR DISI Turbo

Other comparisons

With the 1.0 EcoBoost

With the 2.3 MZR DISI Turbo

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. Ford EcoBoost engineWikipedia · Other source · consulted 26 September 2026
  2. Alerta Ford: la correa de distribución del 1.0 EcoBoost puede romper el motor y la NHTSA ya investigaMotor16 · Motoring press · consulted 26 September 2026 · in Spanish
  3. Los Ford 1.0 EcoBoost tricilíndricos están dando problemas de correas bañadas que recuerdan al caso PureTechMotor.es · Motoring press · consulted 26 September 2026 · in Spanish
  4. Gripa el motor por problema en el manguito se queda sin refrigeranteOpinautos · Owners' forum · consulted 26 September 2026 · in Spanish
  5. Mazda L engineWikipedia (inglés) · Other source · consulted 5 October 2026
  6. Problemas Mazda CX-7Totalrenting · Other source · consulted 5 October 2026 · in Spanish
  7. 2009 Mazda CX-7 engine problemsCarComplaints · Owners' forum · consulted 5 October 2026
  8. Prueba: Ford Fiesta 1.0 EcoBoost 100 CV (2013)km77 · Motoring press · consulted 26 September 2026 · in Spanish
  9. Ford Mondeo Berlina Trend 1.0 EcoBoost 92 kW (125 CV) (2015-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
  10. Ford B-MAX Trend 1.0 EcoBoost 100 CV (2012-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
  11. Mazda CX-7Wikipedia (inglés) · Other source · consulted 5 October 2026
  12. Ford EcoBoost engines: reliability, problems and should you buy one?Carbuyer · Motoring press · consulted 26 September 2026
  13. Ford's Self-Clogging 1.0-Liter EcoBoost Engine Is Finally Getting RecalledThe Drive · Motoring press · consulted 26 September 2026
  14. The Largest Ford EcoBoost Recalls In 15 Years Of ProductionCarBuzz · Motoring press · consulted 26 September 2026
  15. Stellantis no es el único afectado por la correa de distribución bañada en aceiteAutofácil · Motoring press · consulted 26 September 2026 · in Spanish