| While I cannot speak for Mercedes specifically from experience I did have my sister put mid grade in my Jaguar once when she borrowed it. The car did run poorly and acted almost as if I was running out of gas at times. It drove normally again after a tank or two of premium...
Premium is recommended because that is what that particular engine is designed to use. In my opinion not using premium will effect your cars performance negatively and you may even experience some knock....
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