The Porsche M 48.02 is a 2,687 cc, water‑cooled flat‑six petrol engine produced between 2002 and 2005. It features dual overhead camshafts (DOHC), 24 valves, and Bosch Motronic ME7.8 sequential fuel injection. In standard form it delivered 154 kW (210 PS) at 6,200 rpm, with peak torque of 273 Nm at 4,800 rpm.
Fitted exclusively to the Porsche Boxster (986) and Cayman (987) base models in global markets, the M 48.02 offered entry‑level access to Porsche’s signature flat‑six…
Production years 2002–2005 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/9345).
The Porsche M 48.02 is a 2,687 cc flat‑six DOHC petrol engine engineered for entry‑level sports applications (2002–2005). It combines water cooling with sequential fuel injection and a naturally aspirated design to deliver smooth, linear power and classic flat‑six balance. Designed to meet Euro 4 emissions standards, it balances performance accessibility with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,687 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Flat‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 78.0 mm | |
Power output | 154 kW (210 PS) @ 6,200 rpm | |
Torque | 273 Nm @ 4,800 rpm | |
Fuel system | Bosch Motronic ME7.8 sequential injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with intermediate shaft (IMS) | |
Oil type | Porsche A40 (SAE 5W-40) | |
Dry weight | 175 kg |
The Porsche M 48.02 was used across Porsche's 986 Boxster and early 987 Cayman platforms with mid-engine, longitudinal mounting and no external licensing. This engine received running changes—upgraded IMS bearing design from mid-2003 onward and revised cam profiles—and was replaced in 2006 by the M97/21 with VarioCam Plus. All adaptations are documented in OEM technical bulletins.
The M 48.02's primary reliability risk is intermediate shaft (IMS) bearing failure, with elevated incidence in pre-June 2003 examples. Porsche internal service data from 2004 indicated a notable share of early 986/987 engines required IMS-related repairs before 80,000 km, while owner surveys and independent forensic analyses link catastrophic engine failures to bearing seizure. Extended oil change intervals and high-RPM operation accelerate wear, making production date verification and oil discipline critical.
Analysis derived from Porsche technical bulletins (2002–2005) and independent engineering failure logs (2005–2020). Repair procedures should follow manufacturer guidelines; IMS bearing upgrades are widely accepted industry practice for pre-2004 engines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M 48.02 offers smooth flat-six performance but pre-June 2003 units carry IMS bearing risk. Later 2004–2005 models include single-row bearing improvements. With regular oil changes using 5W-40 A40 oil and IMS awareness, well-maintained examples can be dependable for enthusiasts.
Top issues include IMS bearing failure (early engines), rear main seal leaks, cam sensor faults, and valve cover seepage. These are well-documented in Porsche service bulletins and independent reliability studies. The IMS issue is the most critical and potentially catastrophic.
Exclusively the 2002–2004 Porsche Boxster (986) base model and early 2005 Cayman (987) base model, all rated at 210 PS. It was replaced in 2006 by the M97/21 with VarioCam Plus. No cross-manufacturer usage exists.
Yes. Common upgrades include ECU remaps and cat-back exhausts, yielding 230–240 PS. However, the stock internals have modest limits—aggressive tuning risks head gasket or bearing wear. Most owners prioritize drivability; forced induction is rare due to IMS and head design constraints.
Approximately 11–13 L/100km (22–26 mpg UK) in mixed driving. Highway cruising can reach 9 L/100km (31 mpg UK), while aggressive use exceeds 15 L/100km due to the flat-six displacement and performance gearing.
Yes. The Porsche M 48.02 is an interference engine. If the timing chains fail or the IMS bearing seizes and misaligns camshafts, pistons will contact open valves, causing severe internal damage. Regular oil changes and IMS monitoring are essential.
Porsche specifies 5W-40 synthetic oil meeting Porsche A40 standard. This viscosity ensures cam and bearing protection under high-RPM stress. Change intervals should not exceed 15,000 km or annually, with more frequent changes for track or high-load use.
Comprehensive technical documentation and regulatory references
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