The kind of gasoline you put in your car depends upon what kind of vehicle you drive. The owner's manual should provide information on the recommended minimum octane rating for normal operation. Octane ratings are posted on all gas pumps and are calculated according to the gas's ability to reduce engine knock. Engine knock is caused by the pre-ignition of fuel, usually while you're accelerating or pulling a heavy load. Another common cause of knocking is the improper tuning of the engine. As your car ages, it may be necessary to increase the octane rating of the gas you use. Severe knocking from your car's engine needs to be addressed by a mechanic. Most modern fuels contain additives such as detergents and octane boosters which should not be harmful to your car's engine if you purchase the gas from a reputable station. For more information on what kind of gas may be best for your car, consult your owner's manual or contact a mechanic in your area.
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