Lot 3251C: 1998 Porsche 911 Carrera S

Great question! I need to clarify something important about your 1998 Porsche 993 Carrera S: it doesn’t actually have the M96 engine. The 993 generation (1994-1998) uses the air-cooled M64 engine, while the M96 is the water-cooled engine that debuted in the 996 generation (1999-2005).

Your 993 has the M64 air-cooled engine, which has different characteristics:

Common M64 (Air-cooled) Issues:

• Oil leaks from various engine seals (rear main seal, camshaft housing seals)
• Oil consumption can be higher than modern engines
• Chain tensioner wear over time
• Valve guide wear in higher mileage examples
• Engine mount deterioration (many owners upgrade to stiffer RS mounts)

M96 (Water-cooled) Issues you asked about: Since you mentioned the M96 specifically, the main issues with those engines are:

• Intermediate Shaft (IMS) bearing failures
• Rear Main Seal (RMS) leaks
• Cylinder cracking in early versions
• Oil starvation issues on track use
• Cooling system problems

The good news is that your low-mileage 993 (13,694 miles) with its air-cooled M64 engine is generally considered more reliable than the early M96 engines, and being the last year of air-cooled 911s, it’s quite desirable!

Would you like me to help you find similar 993 Carrera S models, or do you have other questions about maintaining this classic?