I can tell that oil is burning, but it's not the valve cover gaskets, its not leaving oil in the driveway...........but I have to add at least a quart every two weeks........can someone help me out here............'00 STS

First step is to get under the car and find out if it really is not leaking.
I never chase an oil burning condition if it could be leaking out.

Do a search on oil burning or using oil.