the dipstick says that I need to add a quart or so of oil but when I take off the oil cap I cannot put in any oil because it is at the top. Any thoughts on what would cause this?

I thought so but I have been putting oil in this Saturn for a couple years now. Literally, when I took off the oil cap to add there was oil almost to the top. I rechecked the dipstick and it showed needing a little over a quart. Checked under fill cap and oil was right there. Dipstick is not broke. I thought maybe it was and it was reading correct. Strangest thing I ever seen..... Is it possible there is a clog somewhere not letting it go down? Im just grasping at straws here.

try this start the engine and see if the level goes down.

I'm on same problem. Hope the dude figures it out by now. I live where streets are terrible, and my oil pan is dented to the point dip reads less. For my own sanity before I replace my pan, need new oil pickup tube.