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I'm not sure about that engine. I think some of the injected Mercs are the same as the Nissan, or at least use the same technology. The oil injection varies with the rpm because at low speeds it doesn't need the same lubrication that it does at wot. With premix you have to mix at 50:1 to cover the wot operation and then at idle and slower speeds you have way too much oil.Mine (Nissan)doesn't smoke at all and used very little oil. I run at cruising speed most of the time and some times faster with an occasional wot. It seems to use about the same amount of oil as if I had been premixing.
A note of caution. I would check with a pro before adding iol to your tank. That may not be good for your injectors.
Mike