Does adding octane booster hurts the engine??? "as some of you know" I live in california and I dislike our poor low 91 octane, so I add some additives to compensate for our low gasoline rating. I can't say low but its not 93 or 94 like some other states.

 

http://www.rx8forum.com/showthread.php?s=&threadid=6479

 

When in doubt, go by what the manual says....that is "don't add aditives".

 

Mr. Moogle, in your post titled "Oil Additives" you ask will octane booster hurt your engine?

It most certainly will if you put it in the oil hole........
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doc