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91 or 93 octane for stock MSM?

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Old 02-21-2015, 10:52 PM
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Default 91 or 93 octane for stock MSM?
Where I live I can either get 91 without ethanol, or 93 with ethanol, which would be better for a stock MSM? Both are from high volume, name brand, top tier gas stations.
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Old 02-22-2015, 03:22 PM
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Use whatever the owner's manual say to use. Don't waste your money.
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Old 02-22-2015, 09:54 PM
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actually cost is the same here, and the manual doesn't cover the impact of ethanol. Im genuinely curious, what if any impact the ethanol has on turbo cars.
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