Maybe the egr cooler is broken then, so you're getting water injection for free currently, haha.
If its using water though, and it's not mixing with the oil or dropping it on the ground, the options are head gasket or egr cooler, I think.
If it's using oil but not dropping it or mixing with water, options are turbo, valve stem seals, CCV, or rings/bores.... I think.
Given your symptoms, my money is on turbo for the oil, and egr cooler for the water. But don't bank on either of those!
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