Over time, the engine can leak oil at various locations. Early-production vehicles require engine disassembly and modification to resolve leaks at the cylinder heads, oil return tubes, valve covers, timing cover, chain housings, case through bolts, and lines to/from the oil cooler.Google+
Car Problem Reports
Porsche 911 Engine Oil Leaks
Porsche 911 Problem
Engines Affected: 3.6L 6 Cylinder, 6 Cylinder
Average Mileage: 57,500 mi (50,000 mi - 65,000 mi)
Oil leak--What needs to be done. What is the cost.
Visitor, 1995 Porsche 911, 65,000 mi
Engine smoking at idle from driver side. Then, oil puddle found under car after winter storage. Upper valve seals need replacing. Done at dealer. Mid- price fix. Around $1000.