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...leaking. What is the problem? I keep the maintenance up and change the oil regularly. It was literally empty of oil after I put 5 quarts in there 5 weeks earlier. It didn't show on the stick at all. It is not leaking oil as I have checked it multiple times with cardboard under the car. The dealership told me I needed to have my timing belt maintenance done and they would change all the internal seals and that would fix the problem. Any other ideas?

 
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Just because its not leaking oil externally it could still be leaking internally. When it leaks internally it just burns up in the engine.

 
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probably burning oil, out the tail pipe, that's why you dint see any leaks , Have a friend follow you down the road, and see if you have any blueish smoke coming out the tailpipe, check it a low speeds and at highway speeds , especially when you give it gas . My guess is the oil is in the catalytic converter , where most of it end up them a seal or a piston ring allows the oil to blow buy the oil ring out the exhaust