If a valve seal is bad it can dump oil and not be visible.
If you don't see any leaks, you either have oil blowing by the pistons or going into the exhuast system via the valve train. Pretty much comes down to one of two things.
1. Take off your spark plugs and see how they look.
2. Remove intake to throttle body and see if you see oil.
3. See if you PCV valve is plugged.
4. Do you get puff of bluish color smoke when you start car?
5. Has car ever overheated?
And if you keep running car sucking down that much oil (suprised it's not smoking while running) then you are going to plug up your catalytic converters in short order. First thing your going to get is a check engine light than car running like doo doo once you reach that point. The cats do an amazing job of hiding smoke from exhaust (until they get plugged).
Death spiral of a motor.......
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