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What gas should I use - 93 w/ Ethanol or 89 without (09 230 Challenger SE 430 HP)

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91 octane is recommended, but my preference between the two would be the 89 without ethanol because of the issues that ethanol can cause. If you only have ethanol blends, use Stabil Marine to help with water in the fuel.
 
If you don't run 91 octane fuel, your engine will more than likely have pre-ignition problems as your engine requires the higher octane based on compression and timing adjustments.

Karl
 
It is worth the extra $$$ for the peace of mind knowing you arent contributing to detonation and a blown engine.
 
The only fuel you need to run is 87 octane and if you can get non ethanol even better, anything more is wasting money.

1 oz of oil to 5 gallons is doing absolutely nothing. If you have oil injection there is no reason to add any oil to the gas.
 
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