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I accidentally put 89 gas in my c300, but i noticed it at $24 and then I switched it to 91 gas and i added $34, what should I do now?
 

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nothing. usually not a problem unless you put diesel in a petrol car or vice versa. At worse you might hear knocking or check engine light on. Just use up the gas that's in there and put in a fuel additive for good measure... mainly just replace it with more of the proper gas next time and you should be good.
 

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Not an issue. Don't worry.
 

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The engine light may have come on for a different reason.

Maybe pop into the dealer and have 'em check it out.
 
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