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unleaded regular in a 300e Mercedes? My Mercedes mechanic says yes as long as you don't hear pinging. Usually if your car is tuned, not pulling or carrying a load, no mountains, not a lot of stop and go traffic, and ac off. try mid grade if you hear pinging with regular, and stick with premium if that does not work.

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Q: Can you put regular unleaded gasoline in a 1993 300E?
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