Check the coolant, and make sure it's not getting in there, and if not, and no leaks, it is burning it. This can be caused by worn oil control rings, worn valve seals or guides, or even a problem with the crankcase ventilation system. The reason that you don't see blue smoke is that the cat converter is burning it up. This will go on until the converter gets plugged and then you will have a drivability problem.
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