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M50 and M52 vs Porsche MA1 / 9A1: which engine is more reliable?

According to our risk index, the Porsche MA1 / 9A1 carries less risk than the M50 and M52: 25/100 (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 Porsche MA1 / 9A1 has 1 documented serious fault, the main one being «Bore scoring in the MA1 of the 997.2 and 987.2: uncommon, but documented».

Risk index

M50 and M52

52

High risk · 2 serious faults

Risk index

Porsche MA1 / 9A1

25

Moderate risk · 1 serious fault

Lower risk

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

21 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 Porsche MA1 / 9A1 reliable?

Yes, it is noticeably more reliable than the M96/M97: it eliminated the intermediate shaft with its IMS bearing and, according to FCP Euro, the connecting rod bolt failures. What is documented is minor: carbon build-up on the intake valves caused by direct injection, coolant pump leaks on the 991.1 and, rarely, bore scoring on the 997.2.[4][5][6][7]

See the 3 of the Porsche MA1 / 9A1 faults

Side-by-side comparison

Comparison of M50 and M52 and Porsche MA1 / 9A1
M50 and M52Porsche MA1 / 9A1
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power150–193 hp255–400 hp
Production1990–2001[8][9][10][11]2009–2016[4][7][12][13][14][15][16]
Reliability
Risk index (what is it?)52High risk25Moderate risk
Documented faults53
Of high or critical severity21
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. Critical severity: Bore scoring in the MA1 of the 997.2 and 987.2: uncommon, but documented
  2. Medium severity: Carbon build-up on the intake valves caused by direct injection
  3. Medium severity: Leaks from the electronically controlled coolant pumps of the 991.1 and the plastic water pump
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNone
  • 3.6 Carrera 345 hp (MA1.02, 2009-2012)[4][6][7]
  • 3.8 Carrera S 385 hp (MA1.01, 2009-2012)[6][7]
  • 2.9 Boxster/Cayman 255-265 hp (MA1.20, 2009-2012, no direct injection)[5][12]
With cautionVersions to be cautious about
  • M50B20, 2.0 litre (150 hp; 1990-1995)[17][18]
  • M50B25, 2.5 litre (192 hp; 1990-1995)[17][18]
  • M52B20, 2.0 litre (150 hp; 1994-1999)[9][17]
  • M52B25, 2.5 litre (170 hp; 1995-1999)[9][17]
  • M52B28, 2.8 litre (193 hp; 1995-1999)[9][17][19]
  • M52TUB20, 2.0 litre (150 hp; 1998-2001)[8][17]
  • M52TUB25, 2.5 litre (170 hp; 1998-2000)[8][17]
  • M52TUB28, 2.8 litre (193 hp; 1998-2001)[3][8][17]
  • 3.4 Boxster S / Cayman S 310-320 hp (MA1.21/.22, 2009-2012, direct injection)[5][20]
  • 3.4 Carrera 350 hp (MA1.04, 2011-2015)[6]
  • 3.8 Carrera S 400 hp (MA1.03, 2011-2015)[6]
  • 2.7 Boxster/Cayman 265-275 hp (MA1.22, 2012-2016)[20][21]
  • 3.4 Boxster S / Cayman S / GTS 315-340 hp (MA1.23, 2012-2016)[20][21]
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

Porsche MA1 / 9A1

Other comparisons

With the M50 and M52

With the Porsche MA1 / 9A1

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. The Definitive Guide To Porsche 997 Engines (M96.05, M97, MA1)FCP Euro · Other source · published 16 January 2024 · consulted 2 November 2026
  5. Porsche 987: The Cayman and Boxster Generation GuideRenn Driver · Buying guide or workshop · published 1 November 2026 · consulted 2 November 2026
  6. Porsche 911: 5 Generationen im Gebrauchtwagen-CheckAUTO BILD · Motoring press · published 22 September 2026 · consulted 2 November 2026 · in German
  7. Porsche 997Wikipedia · Encyclopedia · consulted 2 November 2026
  8. BMW M52Wikipedia (inglés) · Encyclopedia · consulted 2 November 2026
  9. BMW M52Wikipedia (alemán) · Encyclopedia · consulted 2 November 2026 · in German
  10. BMW M50Wikipedia (inglés) · Encyclopedia · consulted 2 November 2026
  11. BMW M50Wikipedia (alemán) · Encyclopedia · consulted 2 November 2026 · in German
  12. Porsche Boxster and Cayman (987)Wikipedia · Encyclopedia · consulted 2 November 2026
  13. Porsche 991Wikipedia · Encyclopedia · consulted 2 November 2026
  14. Porsche Boxster and Cayman (981)Wikipedia · Encyclopedia · consulted 2 November 2026
  15. Differences between M96 and M97 enginesFlat Six Innovations · Buying guide or workshop · published 25 November 2025 · consulted 2 November 2026
  16. List of Porsche enginesWikipedia · Encyclopedia · consulted 2 November 2026
  17. BMW M50 / M52: problemas conocidosEnginescope · Buying guide or workshop · consulted 2 November 2026
  18. Der BMW M50 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki.de · Buying guide or workshop · consulted 2 November 2026 · in German
  19. BMW Z3 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026
  20. Porsche Cayman and Boxster Common Problems: A Specialist Field GuideForeign Automotive · Buying guide or workshop · consulted 2 November 2026
  21. Porsche 981: The Cayman and Boxster Generation GuideRenn Driver · Buying guide or workshop · consulted 2 November 2026