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Porsche M96/M97 vs VR6: which engine is more reliable?

The Porsche M96/M97 and the VR6 tie on our risk index: 50/100 (high risk). The Porsche M96/M97 has 4 documented serious faults, the main one being «Failure of the intermediate shaft bearing (IMS) on the M96/M97»; the VR6 has 1 documented serious fault, the main one being «VR6 timing chain and tensioners».

Risk index

Porsche M96/M97

50

High risk · 4 serious faults

Risk index

VR6

50

High risk · 1 serious fault

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

31 sourcesHow we work

Is the Porsche M96/M97 reliable?

It depends on the version: the M96/M97 has a reputation as a fragile engine because of the IMS bearing, scored cylinders and the rear crankshaft seal, but sources disagree on how many fail and none gives a verified statistic. The most exposed are the 986 and 996 from 1999-2005; the 997.2 and 987.2 from 2009 left this behind with the MA1 engine.[1][2][3][4]

See the 9 of the Porsche M96/M97 faults

Is the VR6 reliable?

Its best-documented faults are the timing chain, with tensioners on the 12-valve versions and stretching on the 3.2 (R32, A3 8P, TT, Cayenne), and, to a lesser extent, the cooling system of the 12-valve versions. The 3.6 FSI comes out of the sources better than the 3.2.[5][6][7]

See the 2 of the VR6 faults

Side-by-side comparison

Comparison of Porsche M96/M97 and VR6
Porsche M96/M97VR6
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power204–355 hp140–300 hp
Production1996–2008[1][2][8][9][10][11][12]1991–2024[13][14][15]
Reliability
Risk index (what is it?)50High risk50High risk
Documented faults92
Of high or critical severity41
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: Failure of the intermediate shaft bearing (IMS) on the M96/M97
  2. Critical severity: Scored cylinders (bore scoring) and ‘Kolbenkipper’ on the M96/M97
  3. Critical severity: Porous blocks and cracked or displaced liners in the first M96s
  1. Critical severity: VR6 timing chain and tensioners
  2. Medium severity: 12-valve VR6 cooling: water pump, thermostat and plastic pipes
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 2.5 Boxster 204 hp (M96.20, 1996-1999)[16][17]
  • 2.7 and 3.2 S Boxster 220-258 hp (M96.21/.22/.23/.24, 1999-2004)[2][16]
  • 3.4 Carrera 300 hp (M96.01/.02/.04, 1997-2001)[2][18][19]
  • 3.6 Carrera 320 hp (M96.03, 2002-2005)[2][20]
  • 3.6 and 3.8 S of the 997.1, 325-355 hp (M96.05 / M97.01, 2004-2008)[3][12][21]
  • 2.7, 3.2 S and 3.4 S of the 987.1, 240-295 hp (M96.26 / M97.21 / M97.22, 2004-2008)[22][23]
  • 2.8 VR6 12V 140-174 hp (AAA, AMY, AES; 1991-2000)[5][24]
  • 2.9 VR6 12V 190 hp (ABV; 1994-1997)[5]
  • 2.8 V6 24V 204 hp (AQP, AUE, BDE, AMV, AYL; 1999-2008)[6][25][26]
  • 3.2 VR6 220-250 hp (BFH, BML, BDB, BMJ, BUB, BHE, BDL, BKK, AZZ, AXZ, CBRA; 2001-2010)[6][7][27][28]
  • 3.6 VR6 FSI 249-300 hp (BLV, BWS, CDVA, CCZB, CNNA, CMTA; 2005-2018)[7][29][30][31]
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

Porsche M96/M97

VR6

See the 24 models with the VR6

Other comparisons

With the Porsche M96/M97

With the VR6

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. Porsche 996Wikipedia · Other source · consulted 2 November 2026
  2. What are the most common 996 Issues?Flat Six Innovations · Other source · published 23 November 2025 · consulted 2 November 2026
  3. Porsche 911: 5 Generationen im Gebrauchtwagen-CheckAUTO BILD · Motoring press · published 22 September 2026 · consulted 2 November 2026 · in German
  4. Differences between M96 and M97 enginesFlat Six Innovations · Other source · published 25 November 2025 · consulted 2 November 2026
  5. VW Golf III VR6 (1991-1998)AutoBild · Motoring press · published 1 September 2003 · consulted 2 November 2026 · in German
  6. VW Golf IV (1J): Schwachstellen und KaufberatungGebrauchtwagenberater.de · Motoring press · consulted 2 November 2026 · in German
  7. Gebrauchtwagen-Kaufberater: Was kann der Porsche Cayenne 9PA?AutoScout24 · Motoring press · consulted 2 November 2026 · in German
  8. Porsche Boxster (986)Wikipedia · Other source · consulted 2 November 2026
  9. List of Porsche enginesWikipedia · Other source · consulted 2 November 2026
  10. Porsche 997Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  11. Porsche Boxster and Cayman (987)Wikipedia · Other source · consulted 2 November 2026
  12. The Definitive Guide To Porsche 997 Engines (M96.05, M97, MA1)FCP Euro · Other source · published 16 January 2024 · consulted 2 November 2026
  13. VR6 engineWikipedia (inglés) · Other source · consulted 2 November 2026
  14. VR6-MotorWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  15. VW EA390Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  16. 1st Generation Porsche Boxster 986 Buyer's GuideStuttcars.com · Motoring press · consulted 2 November 2026
  17. Porsche Boxster (986) 1996-2004: Stärken und Schwächenauto motor und sport · Motoring press · published 6 March 2021 · consulted 2 November 2026 · in German
  18. Porsche 996 (1997-2006) Kaufberatung: Stärken & Schwächenauto motor und sport · Motoring press · published 11 December 2018 · consulted 2 November 2026 · in German
  19. 996 Buyer's GuideRennsportKC · Other source · published 10 March 2011 · consulted 2 November 2026
  20. Porsche 911 996 Buying GuideMotorious · Motoring press · published 17 October 2018 · consulted 2 November 2026
  21. Porsche 911 Common Problems: Every Generation, Every Major IssueRenn Driver · Other source · published 4 May 2026 · consulted 2 November 2026
  22. Porsche Boxster (987) Buyer's GuideGoodwood Classic Solutions · Motoring press · published 1 March 2024 · consulted 2 November 2026
  23. Porsche Cayman and Boxster Common Problems: A Specialist Field GuideForeign Automotive · Other source · consulted 2 November 2026
  24. Tous les problèmes sur Volkswagen Golf III (1991-1998)Fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
  25. Seat Leon I: Bekannte Probleme & RückrufeGebrauchtwagenberater.de · Motoring press · published 9 April 2025 · consulted 2 November 2026 · in German
  26. VW Bora (1J2): Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 14 July 2022 · consulted 2 November 2026 · in German
  27. VW Golf 4: ProblemeCarWiki.de · Other source · consulted 2 November 2026 · in German
  28. Audi TT: ProblemeCarWiki.de · Other source · consulted 2 November 2026 · in German
  29. VW Passat CC: Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 2 November 2026 · in German
  30. Probleme mit dem Porsche Cayenne (9PA y 92A)CarWiki.de · Other source · consulted 2 November 2026 · in German
  31. Tous les problèmes sur Volkswagen Passat (2004-2010)Fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French