A 2001 Mercedes E320 typically uses premium unleaded gasoline with an octane rating of 91 or higher. Using higher octane fuel helps to optimize engine performance and efficiency. It's important to avoid regular unleaded gasoline, as it may lead to knocking and potentially harm the engine over time. Always consult the owner's manual for specific fuel recommendations.
Same answer as this question.How_do_you_release_the_fuel_door_on_a_1992_Mercedes_300E
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If the engine is a diesel use diesel fuel. If the engine is a gasoline engine use unleaded gasoline.
Press on the left side of door it will flip open.
You can try going to the gas station and asking...
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