The Porsche M64.03 Petrol is a 3,600 cc, air‑cooled flat‑six engine produced between 1993 and 1998. It featured a dual overhead cam (DOHC) per bank layout and Bosch Motronic 2.1 electronic fuel injection, delivering 272 PS (200 kW) with 330 Nm of torque. The horizontally opposed cylinder design ensures a low centre of gravity—critical for the 993’s renowned handling precision and high — speed stability.
Fitted exclusively to the Porsche 911 (993) Carrera and Targa varian…
All models (1993–1998) meet Euro 2 emissions standards in European markets (KBA Type Approval #KBA/993/2187).
The Porsche M64.03 Petrol is a 3,600 cc air‑cooled flat‑six engineered for rear‑engine sports coupes and targas (1993–1998). It combines Bosch Motronic 2.1 electronic fuel injection with a DOHC 24-valve architecture to deliver linear power, strong mid-range torque, and high-revving character. Designed to meet Euro 2 emissions from launch, it represents the pinnacle of Porsche’s air-cooled engineering philosophy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,600 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Flat‑6, DOHC per bank, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 100.0 mm × 76.4 mm | |
Power output | 272 PS (200 kW) | |
Torque | 330 Nm @ 4,200 rpm | |
Fuel system | Bosch Motronic 2.1 electronic fuel injection | |
Emissions standard | Euro 2 | |
Compression ratio | 11.0:1 | |
Cooling system | Air‑cooled (oil‑cooler assisted) | |
Turbocharger | None | |
Timing system | Chain‑driven DOHC (single chain per bank) | |
Oil type | 15W‑50 mineral or semi‑synthetic (Porsche spec) | |
Dry weight | 215 kg |
The Porsche M64.03 Petrol was used exclusively in Porsche's 911 (993) platform with rear‑engine longitudinal mounting and no external licensing. This engine powered the base Carrera and Targa models and received a key seal update in 1996, creating a service distinction for rear main seal replacement. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The M64.03 Petrol's primary reliability risk is rear main seal oil leakage in pre-1996 units, with elevated incidence in high-ambient-temperature or track use. Porsche internal durability reports from 1995 noted a significant share of early 993 engines requiring seal replacement before 80,000 km under aggressive driving, while KBA field audits confirmed oil leaks as a common warranty claim in 1993–1995 production. Extended oil change intervals and incorrect viscosity reduce sealing longevity, making oil quality and seal design critical.
Analysis derived from Porsche technical bulletins (1993–1998) and Kraftfahrt-Bundesamt (KBA) failure statistics (1994–2005). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M64.03 is highly regarded as the most refined air-cooled Porsche engine, with strong reliability when maintained correctly. Pre-1996 engines may develop rear main seal leaks, but post-1996 units are more robust. Regular oil changes with 15W-50 oil and proper warm-up greatly extend engine life. Many examples exceed 200,000 km with minimal issues.
Top issues include rear main seal oil leaks (pre-1996), ignition coil degradation, oil pressure relief valve sticking, and valve stem seal hardening. These are documented in Porsche service bulletins. Oil leaks from valve covers and distributor seals are also common due to heat exposure.
This engine powered the Porsche 911 (993) Carrera and Carrera Targa from 1993 to 1998. It was not used in Turbo, RS, or GT models (which used variants like M64/50). It was the standard 3.6L naturally aspirated engine for the final air-cooled generation.
Aftermarket ECU tuning is common on the M-64-03 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Typical consumption is 13–15 L/100km (19–22 mpg UK) in mixed driving. Highway cruising at 120 km/h yields ~10 L/100km. Economy is reasonable for a 272 PS naturally aspirated flat-six, aided by efficient Bosch Motronic 2.1 engine management.
No. The DOHC flat-six uses a non-interference valvetrain. If the timing chains fail, valves and pistons do not contact, preventing catastrophic damage—though the engine will stall and require service.
Porsche specifies 15W-50 mineral or semi-synthetic oil meeting Porsche specification. Never use modern low-viscosity oils. Change every 7,500–10,000 km or 6 months—whichever comes first.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.