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If I use 89 octane, but my car calls for 91 octane will this damage the engine?

If I use 89 octane, but my car calls for 91 octane, will this damage the engine?


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It will be ok! if your engine doesnt ping under a load it will be ok. the timing has an auto adjustment to compensate.

Posted 2008-04-15T16:17:34Z
carsfastfredi was invited by Yedda to answer this question.

 
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But you won't get the best performance out of it.  You are wasting the advantages of the higher compression of the engine.

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