BMW N62 / N63 vs 0.9 TCe: which engine is more reliable?

According to our risk index, the 0.9 TCe carries less risk than the BMW N62 / N63: 49/100 (moderate risk) versus 54/100 (high risk). The BMW N62 / N63 has 3 documented serious faults, the main one being «N63 oil consumption from worn valve stem seals»; the 0.9 TCe has 3 documented serious faults, the main one being «Coolant leak at the thermostat housing».

Risk index

BMW N62 / N63

High risk · 3 serious faults

Risk index

0.9 TCe

Moderate 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 202616 sources How we work

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.^{[1][2][3][4][5]}

See the 6 of the BMW N62 / N63 faults

Is the 0.9 TCe reliable?

The 0.9 TCe (H4Bt) is a three-cylinder turbo with a good reliability reputation, better than that of its sibling the 1.2 TCe: it does not share the same oil consumption or the same rate of chain problems. Its most-cited weak point is a coolant leak at the thermostat housing, which if ignored can end up damaging the head gasket; chain, turbo and lambda sensor cases appear less often.^[6][7]

See the 5 of the 0.9 TCe faults

Side-by-side comparison

Comparison of BMW N62 / N63 and 0.9 TCe
Item	BMW N62 / N63	0.9 TCe
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	—	898 cm³
Timing	Chain	Chain
Power	272–450 hp	90 hp
Production	since 2001^{[3][8][9][10]}	2012–2024^{[6][7][11][12][13]}
Reliability
Risk index (what is it?)	54High risk	49Moderate risk
Documented faults	6	5
Of high or critical severity	3	3
Worst severity	Critical severity	Critical severity
Main faults	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	High severity: Coolant leak at the thermostat housing Critical severity: Timing chain or tensioner failure High severity: Turbocharger wear or failure
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	N62B48TU 4.8 naturally aspirated 355-367 hp (550i, 650i, 750i, X5 4.8i; 2005-2010)^[2][4]	None
With cautionVersions to be cautious about	N62B36 3.6 naturally aspirated 272 hp (735i, 2001-2005)^[1][4] N62B40 4.0 naturally aspirated 306 hp (540i and 740i, 2005-2010)^[1][5] N62B44 4.4 naturally aspirated 320-333 hp (545i, 645Ci, 745i, X5 4.4i; 2001-2006)^[1][5][14] N62B48 4.8 naturally aspirated 360 hp (X5 4.8is, 2004-2006)^[15] N63B44O1 (N63TU) 4.4 twin-turbo 450 hp (2013-2019)^[3]	0.9 TCe 90 (H4Bt, 2012-2024)^[6][7]
AvoidVersions to avoid	N63B44O0 4.4 twin-turbo 408 hp (2008-2014)^[3][16]	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

BMW N62 / N63

See the 12 models with the BMW N62 / N63

0.9 TCe

See the 8 models with the 0.9 TCe

Other comparisons

With the BMW N62 / N63

With the 0.9 TCe

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.

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
Fiabilité des 0.9 TCeFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Moteur H Renault-NissanWikipedia (francés) · Other source · consulted 27 September 2026 · in French
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
Mercedes-Benz M281 engineWikipedia (inglés) · Other source · consulted 27 September 2026
Renault ClioWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
Dacia SanderoWikipedia (español) · Other source · consulted 27 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