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A higher octane fuel(94+). Shell has a lot of cleaning additives to their fuel, up to four times the industrial standard.

All gasoline today has additives added that help keep injectors clean. There is no more cleaning additive in Shell 94 octane fuel than there is in Shell 87 octane fuel. Using a high octane fuel in a vehicle designed to run on 87 octane is a total waste of money and provides no benefit whatsoever. Once each year add a can of Seafoam, Techron, or any other high quality fuel system cleaner to a full tank of fuel and you will be fine.

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Q: What is the best gas to use to keep fuel injectors clean?
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