Mercedes says that the time to have it looked at is when the engine uses more than 1qt every 600mi. I think that I would have it looked at before that though so as not to clog the cat.
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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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