1.0 EcoBoost vs BMW N62 / N63: which engine is more reliable?

According to our risk index, the BMW N62 / N63 carries less risk than the 1.0 EcoBoost: 54/100 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 BMW N62 / N63 has 3 documented serious faults, the main one being «N63 oil consumption from worn valve stem seals».

Risk index

1.0 EcoBoost

High risk · 3 serious faults

Risk index

BMW N62 / N63

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 8 October 202622 sources How 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 BMW N62 / N63 reliable?

The N62 (naturally aspirated V8, 2001-2010) is considered a solid engine, with the coolant hoses and valve stem seals as points to watch. The N63 (twin-turbo V8, since 2008) has a worse reputation: oil consumption from the seals, the timing chain and coolant loss; the post-July 2013 N63TU is considered more reliable.^{[5][6][7][8][9]}

See the 6 of the BMW N62 / N63 faults

Side-by-side comparison

Comparison of 1.0 EcoBoost and BMW N62 / N63
Item	1.0 EcoBoost	BMW N62 / N63
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	999 cm³	—
Timing	Wet belt (belt-in-oil)	Chain
Power	100–155 hp	272–450 hp
Production	since 2012^{[1][10][11][12]}	since 2001^{[7][13][14][15]}
Reliability
Risk index (what is it?)	71High risk	54High risk
Documented faults	4	6
Of high or critical severity	3	3
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Degradation of the timing belt running in oil Critical severity: Oil pump belt and tensioner failure Critical severity: Coolant leaks and overheating from the turbo hose	High severity: N63 oil consumption from worn valve stem seals Critical severity: N63 timing chain stretch and guide breakage Critical severity: Additional turbo coolant pump with a risk of short circuit and fire
Most expensive documented repair	up to €1,200Degradation of the timing belt running in oilPublished figure^[2]	No reliable data
Which versions to buy
BuyRecommended versions	None	N62B48TU 4.8 naturally aspirated 355-367 hp (550i, 650i, 750i, X5 4.8i; 2005-2010)^[6][8]
With cautionVersions to be cautious about	1.0 EcoBoost 100/125 (Fox, 2012-2017)^[2][3][16] 1.0 EcoBoost 100/125/140 with cylinder deactivation (from ~2017)^[17][18] 1.0 EcoBoost Hybrid 48V mild hybrid (125/155 hp, from 2019)^[1][19]	N62B36 3.6 naturally aspirated 272 hp (735i, 2001-2005)^[5][8] N62B40 4.0 naturally aspirated 306 hp (540i and 740i, 2005-2010)^[5][9] N62B44 4.4 naturally aspirated 320-333 hp (545i, 645Ci, 745i, X5 4.4i; 2001-2006)^[5][9][20] N62B48 4.8 naturally aspirated 360 hp (X5 4.8is, 2004-2006)^[21] N63B44O1 (N63TU) 4.4 twin-turbo 450 hp (2013-2019)^[7]
AvoidVersions to avoid	None	N63B44O0 4.4 twin-turbo 408 hp (2008-2014)^[7][22]

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 11 models with the 1.0 EcoBoost

BMW N62 / N63

See the 12 models with the BMW N62 / N63

Other comparisons

With the 1.0 EcoBoost

With the BMW N62 / N63

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.

Ford EcoBoost engineWikipedia · Other source · consulted 26 September 2026
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
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
Gripa el motor por problema en el manguito se queda sin refrigeranteOpinautos · Owners' forum · consulted 26 September 2026 · in Spanish
BMW 5er E60, E61 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 26 April 2024 · consulted 8 October 2026 · in German
BMW X5 E70 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 5 January 2023 · consulted 8 October 2026 · in German
BMW 5er F10, F11: Typische Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 8 October 2026 · in German
BMW 6er E63, E64 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 5 January 2023 · consulted 8 October 2026 · in German
BMW 650i: Gebrauchtwagen-TestAUTO BILD · Motoring press · published 4 December 2015 · consulted 8 October 2026 · in German
Prueba: Ford Fiesta 1.0 EcoBoost 100 CV (2013)km77 · Motoring press · consulted 26 September 2026 · in Spanish
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
Ford B-MAX Trend 1.0 EcoBoost 100 CV (2012-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
BMW N62Wikipedia (inglés) · Other source · consulted 8 October 2026
BMW N63Wikipedia (inglés) · Other source · consulted 8 October 2026
BMW N62Wikipedia (alemán) · Other source · consulted 8 October 2026 · in German
Ford EcoBoost engines: reliability, problems and should you buy one?Carbuyer · Motoring press · consulted 26 September 2026
Ford's Self-Clogging 1.0-Liter EcoBoost Engine Is Finally Getting RecalledThe Drive · Motoring press · consulted 26 September 2026
The Largest Ford EcoBoost Recalls In 15 Years Of ProductionCarBuzz · Motoring press · consulted 26 September 2026
Stellantis no es el único afectado por la correa de distribución bañada en aceiteAutofácil · Motoring press · consulted 26 September 2026 · in Spanish
BMW 745i (E65): Test über 100.000 kmAUTO ZEITUNG · Motoring press · published 12 January 2018 · consulted 8 October 2026 · in German
BMW X5 E53 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 4 January 2023 · consulted 8 October 2026 · in German
Fiabilité Bmw Serie 5 (2010-2016) (252 témoignages)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French