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M50 and M52 vs 0.9 TCe: which engine is more reliable?

According to our risk index, the 0.9 TCe carries less risk than the M50 and M52: 49/100 (moderate risk) versus 52/100 (high risk). The M50 and M52 has 2 documented serious faults, the main one being «Cooling system failure (expansion tank, thermostat, pump and radiator)»; the 0.9 TCe has 3 documented serious faults, the main one being «Coolant leak at the thermostat housing».

Risk index

M50 and M52

52

High risk · 2 serious faults

Risk index

0.9 TCe

49

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

15 sourcesHow we work

Is the M50 and M52 reliable?

The M52 and its predecessor the M50 are six-cylinder petrol engines that the sources describe as durable: Enginescope considers 300,000 km routine with the cooling circuit looked after. Watch the plastic cooling parts, VANOS, crankcase ventilation and oil leaks and, in the aluminium-block M52s built from 1995 to March 1998, cylinder wear caused by sulphur (Nikasil).[1][2][3]

See the 5 of the M50 and M52 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.[4][5]

See the 5 of the 0.9 TCe faults

Side-by-side comparison

Comparison of M50 and M52 and 0.9 TCe
M50 and M520.9 TCe
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement—898 cm³
TimingChainChain
Power150–193 hp90 hp
Production1990–2001[6][7][8][9]2012–2024[4][5][10][11][12]
Reliability
Risk index (what is it?)52High risk49Moderate risk
Documented faults55
Of high or critical severity23
Worst severityCritical severityCritical severity
Main faults
  1. High severity: Cooling system failure (expansion tank, thermostat, pump and radiator)
  2. Critical severity: Premature cylinder wear (Nikasil coating)
  3. Medium severity: Worn VANOS seals
  1. High severity: Coolant leak at the thermostat housing
  2. Critical severity: Timing chain or tensioner failure
  3. High severity: Turbocharger wear or failure
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • M50B20, 2.0 litre (150 hp; 1990-1995)[13][14]
  • M50B25, 2.5 litre (192 hp; 1990-1995)[13][14]
  • M52B20, 2.0 litre (150 hp; 1994-1999)[7][13]
  • M52B25, 2.5 litre (170 hp; 1995-1999)[7][13]
  • M52B28, 2.8 litre (193 hp; 1995-1999)[7][13][15]
  • M52TUB20, 2.0 litre (150 hp; 1998-2001)[6][13]
  • M52TUB25, 2.5 litre (170 hp; 1998-2000)[6][13]
  • M52TUB28, 2.8 litre (193 hp; 1998-2001)[3][6][13]
  • 0.9 TCe 90 (H4Bt, 2012-2024)[4][5]
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

M50 and M52

0.9 TCe

See the 8 models with the 0.9 TCe

Other comparisons

With the M50 and M52

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.

  1. BMW 3 Series E36 320i (M52B20): reliabilityEnginescope · Buying guide or workshop · consulted 2 November 2026
  2. BMW M52 reliabilityAutoscore · Buying guide or workshop · consulted 2 November 2026
  3. BMW M52 Engine: Performance, Reliability, and TuningBMWBlog · Motoring press · consulted 2 November 2026
  4. Fiabilité des 0.9 TCeFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Moteur H Renault-NissanWikipedia (francés) · Encyclopedia · consulted 27 September 2026 · in French
  6. BMW M52Wikipedia (inglés) · Encyclopedia · consulted 2 November 2026
  7. BMW M52Wikipedia (alemán) · Encyclopedia · consulted 2 November 2026 · in German
  8. BMW M50Wikipedia (inglés) · Encyclopedia · consulted 2 November 2026
  9. BMW M50Wikipedia (alemán) · Encyclopedia · consulted 2 November 2026 · in German
  10. Mercedes-Benz M281 engineWikipedia (inglés) · Encyclopedia · consulted 27 September 2026
  11. Renault ClioWikipedia (español) · Encyclopedia · consulted 27 September 2026 · in Spanish
  12. Dacia SanderoWikipedia (español) · Encyclopedia · consulted 27 September 2026 · in Spanish
  13. BMW M50 / M52: problemas conocidosEnginescope · Buying guide or workshop · consulted 2 November 2026
  14. Der BMW M50 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki.de · Buying guide or workshop · consulted 2 November 2026 · in German
  15. BMW Z3 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026