Quote:
Originally Posted by JDMDreams
^^ does octane booster work? I've always wondered if it will have any performance improvement over premium gas
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Can't verify if it works. But I know a friend used octane booster when he ran out of E85. Car wasn't tuned on E85, it was a jdm import, so he found that Canadian gas wasn't cutting it.
The PO of my M3 also said that the car ran better with a bottle of octane booster + Shell 91, as compared to just running pure Chevron 94.