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If you put leaded gas in an engine that is designed to run on unleaded gas, while the engine will run, it will not run optimally and you will ruin the catalytic converter.

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14y ago

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Does unleaded engine can use premium gasoline?

Yes you can use premium gasoline in unleaded because premium gasoline is also unleaded. The only reason it is called premium gasoline is because it has a higher octance then regular unleaded. Regular unleaded has an octane rating of 87 and premium has an octane rating of 92. Premium gasoline burns slower then regualr gas because it has a higher octane rating.


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any 440 takes premium gas.


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Bad idea. Most cars that are Premium Only are designed to take about 92 octane fuel at the lowest. The car will, in fact, run with super unleaded gas but it will create damage to your engine in the long-run. And if low octane gas is used frequently, it can greatly reduce the life of your car.


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No, premium is unleaded gas as well and the difference in octane ratings between regular (87) and premium (91) is is not going to cause an engine to seize. Running the gas/oil ratio to lean will though.


Is it better to use reg unleaded or premium unleaded in a 1999 Harley Davidson Softtail?

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What is another name for super unleaded gas?

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