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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Originally Posted by KUweatherman
You can do just as much harm by putting in too high an octane as you can too low an octane. The E90 should take 91, nothing more and nothing less. You can get away with 88-89 occasionaly though, but it's best to stick to 91.
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