2000 Mercedes Benz SLK230

Engine Performance problem
2000 Mercedes Benz SLK230 6 cyl Two Wheel Drive Automatic 117, 00 miles

I am on the Hopi Indian Reservation for the next 2 months and am unable to purchase anything but regular unleaded gas and have been using supreme unleaded gas since purchased car. Can I use an octane booster when I fill up the gas and NOT do any damage to the engine? Are there any other alternatives?
S. Massey
January 13, 2010.

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