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2019 Mercedes-Benz GL-Class - What fuel

we bought a mercedes-2019-the manufacturer recommends that we use 91 octane only. Is this necessary or can we use a lower octane

Does your manual say recommend or required . If required then that should be all that you use period. If recommended then you can use regular unleaded but why would you cheap out on an expensive vehicle like this ? I say use premium during the warranty period .

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