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Octane boosters are pretty strong chemicals. My race motorcycle required octane booster or race gas. You can buy pure octane boosters at home depot or a paint supply store. Xyline is the chemical. It's also used to thin paints.
Unless you are racing the car and need that extra edge, why waste money on octane boosters. Just by top tier Shell 93 octane gas. Shell 93 super v nitro is what BMW M recommends.
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