Real slow oil leak on back of engine (can't determine source)

[steppinthrax]

I have a 99 4cyl toyota camry. It's got 70K on the odo. I recently did an oil change and drove 400 miles. When i went to filll up I notice the oil was below the L mark on the dipsitck. I put in a quart and drove off. I checked it again and noticed it dropped a bit. I run the engine and can't see any oil physically dropping out of the engine. I lifted the car up and noticed the following areas.

1. No oil around oil pan
2. No oil around timming cover.
3. No oil around tranmission.
4. if I look up I see oil drops hanging for most of the intake manifold bolts.

So my only thinking is if the intake manifold gasket is bad can oil leak from the engine!!!!!

[MR2Jedi]

I would suspect the valve cover gasket. try retightening the bolts and see if that stops the drip.