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Originally Posted by Toronto330
Not true.
The octane rating is a representation of the anti-knock properties of motor fuel and nothing more. The higher the number value the stronger the resistance to detonation. Using fuel with a higher than recommended octane rating will not do you harm but you might be wasting your money.
I say "might" because even though 2 engines built by a manufactuer may be identical, but still they are not exactly the same and the octane needs of a given engine model can vary by as much as 6 octane numbers, so you could actually benefit from using higher than 91 or "get away" with using lower than 91.
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While I totally agree with you that using a higher octane is certainly a waste of money, I dont agree that there wont be any damage involved. In most cases, there probably wont be any damage. But there is the chance of carbon deposits building up in the emissions systems causing damage. By going with what you said, I could use 100 octane in my car and get away with it. We both should know this is certainly not the case. There is a reason manufactuers have a suggested octane. Stick to it...unless there is pinging, then go to the next highest octane. However, using 91 in the E90, this shouldnt be the case. If it is, there is probably a more important underlying problem.