With oil consumption in that range your cat is probably about dead. I wouldn't go into the test right away. Take it on a sustained speed drive a a few hundred miles with something like BG's 44K in the tank. It is designed to reduce carbon and may help get some off of the cat structure.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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