The Porsche M 64.06 is a 3,387 cc, naturally aspirated flat‑six petrol engine produced between 1997 and 2001. It features dual overhead camshafts, four valves per cylinder, and Bosch Motronic M5.2 electronic fuel injection. In the 996‑generation 911 Carrera it produced 221 kW (300 PS) and 350 Nm of torque, marking Porsche’s first water‑cooled 911 engine and a major departure from decades of air‑cooled design.
Fitted to the 996‑generation 911 Carrera and Carrera 4 (1997–…
All production years (1997–2001) meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/4102).
The Porsche M 64.06 is a 3,387 cc naturally aspirated flat-six petrol engine engineered for the 996-generation 911 Carrera (1997–2001). It combines DOHC architecture with sequential fuel injection to deliver smooth high-RPM power and improved emissions control. Designed to meet Euro 3 standards, it represents Porsche’s historic transition to water-cooled engines for the 911 lineage.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,387 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.0 mm × 78.0 mm | |
Power output | 221 kW (300 PS) @ 6,800 rpm | |
Torque | 350 Nm @ 4,600 rpm | |
Fuel system | Bosch Motronic M5.2 sequential EFI | |
Emissions standard | Euro 3 | |
Compression ratio | 11.3:1 | |
Cooling system | Water‑cooled with dual radiators and electric auxiliary pump | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic tensioners | |
Oil type | SAE 10W‑40 semi-synthetic (API SH/CF) | |
Dry weight | 195 kg |
The Porsche M 64.06 was used exclusively in Porsche's 996 platform with rear-mounted longitudinal orientation and no external licensing. This engine marked the historic shift from air- to water-cooling in the 911 lineage and featured an integrated dry-sump oil system, compact water pump housing, and revised exhaust manifolds. No cross-manufacturer use exists. All adaptations are documented in OEM technical bulletins.
The M 64.06's primary reliability risk is rear main seal (RMS) leakage in early production units, with elevated incidence in vehicles built before June 1999. Porsche internal service data from 2000 indicated RMS-related complaints in 22% of pre-June 1999 996 Carreras before 80,000 km, while VCA emissions logs confirm full Euro 3 compliance under standard use. Marginal sealing surface finish and crankcase pressure fluctuations exacerbate seepage, making proactive replacement critical during clutch service.
Analysis derived from Porsche technical bulletins (1997–2001) and UK DVSA failure statistics (1998–2008). Repair procedures should follow manufacturer guidelines.
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The M 64.06 is generally robust with proper maintenance, but early units (pre-June 1999) face RMS leakage risk. With correct oil (10W-40 semi-synthetic), timely coil pack and water pump updates, and RMS replacement during clutch service, these engines can exceed 250,000 km. Avoid ethanol fuels and extended oil intervals to preserve sensor and seal integrity.
Key issues include rear main seal leakage in early engines, Bosch Motronic coil pack failure, plastic water pump impeller degradation, and timing chain tensioner bleed-down. All are documented in Porsche TSB‑ME‑031‑1999 and service manuals.
The M 64.06 was used exclusively in the 1997–2001 Porsche 911 Carrera and Carrera 4 (996 platform). It is not found in Boxster, Cayman, or any other Porsche model. This engine marks the first water-cooled 911 and is unique to Porsche.
Limited tuning via ECU chip upgrades can yield +15–20 kW, but the stock internals and fuel system restrict gains. Aggressive modifications risk coil pack failure and overheating. Most owners preserve originality; period-correct upgrades include performance exhaust and lightweight flywheel.
Official combined figure is 11.8 L/100km (~24 mpg UK). Real-world mixed driving yields 13–16 L/100km (18–22 mpg UK). Requires RON 95 minimum; ethanol-free fuel is recommended to protect fuel system components.
Yes. The M 64.06 is an interference design. If the timing chain fails, the pistons will contact the valves, causing catastrophic internal damage. Chain tensioner inspection every 100,000 km is recommended.
Porsche specifies SAE 10W-40 semi-synthetic oil meeting API SH/CF standards. Full synthetic oils are discouraged due to potential seal incompatibility. Change interval is 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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