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Recently replaced both catalytic convs/both o2 sensors/valve cover gask/spark plugs in 03 Nissan Altima. Now engine is burning tons of oil (7 qts in 4 days)! The oil on the stick is black. No leaks. White smoke on cold start. Any ideas on a fix?

check for oil in water or

check for oil in water or visa versa and have a chemical check of coolant - suspect head gasket problem

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