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on after i put 87 octane. just got my C230 2day. if it say premium only does it mean that really and i see a 1 wrench flashing ??? i know i have to read the manual ....
 

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Welcome to the forum and congratulations on your car.

When they say premium, they mean it. Add some octane booster, and whenever you can put in a few gallons, top up with premium. Also make sure the fuel cap in seated properly. This can make the check engine light come on, too. Another cause thing that will cause the check engine light to come on is overfilling the tank. When the pump shuts off, that's it. Don't try to put in more gas.
 
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