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What is the best fuel octane rating for a BMW M3?

I recently purchased a BMW M3 and I am unsure what fuel octane rating to use. I have heard conflicting opinions and I want to make sure I am using the best fuel for my car's performance without causing damage. Can you provide any advice?

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The recommended fuel octane rating for a BMW M3 is 91 or higher. Using a lower rating can decrease performance and potentially cause engine damage. Stick with the recommended rating to ensure optimal performance and longevity for your vehicle.

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I have been using 93 octane in my BMW M3 and have noticed a significant improvement in performance compared to when I was using 87. While it may be more expensive, I believe it's worth it for the added boost of power.

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