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Ive been having trouble trying to find anything better than 91 at the pump so I went to Kragen and bought some super 104. There was definately a noticable difference. Are there any side effects or downsides like wearing out an o2 sensor faster? Anybody else use em?
 

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well, it increases octane less than one octane point and puts orange crud on the plugs and sensors...If you want to do something that really works, buy some xylene or toluene and add it to the tank.
 
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