I have a C6 Convertible with 110k miles. She runs great and am happy with her, however, when I park in the driveway which is at a slight incline, after 2 hours or so she seems to leak some type of oil.
After inspecting the oil, I can not tell if its motor oil or power steering fluid. It is definitely not coolant or transmission oil. When I look under the car there is no oil towards the back of the oil pan which is where I expected the leak to be. It is also not the valve covers either. If I park the car in the garage or on any level surface she does not leak anything at all. Has anyone experienced this type of leak and what do you think could be the source.

Many thanks in advance

 

Jack it up and take a close look. oil always leaves a trail.

 

I have, there is nothing at the front of the oil pan, the water pump is dry and the power steering pump is dry too. if anything was going to leak when it is up a driveway you would think it would be at the back of the motor, but this is right at the front of the motor. I suppose I will put her on ramps and slide under with plenty of lighting.

 

The seal around the harmonic balancer snout is another potential leak point.

There are multiple places for the power steering fluid to leak out as a car ages. As Thomas suggested, you need to get the car in the air so you can check underneath.