Question:
Why do some cars require this and some do not. What happens if you need Regular and you put Super and visa-versa?
Answers:
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Use whatever fuel is recommended by manufacturer. Do NOT use a higher or lower octane than recommended on a computer (fuel injected) engine. The computer program is based on the recommended fuel and the engine will not perform properly without the proper grade of fuel.
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Super has a higher OCTANE rating which just means it burns slower in the engine, so in high performance engines it won't "knock" like regular grade. If you need ragular and use super you just waste money cause it costs more - won't hurt a thing. l If your car needs super and you use regular it will not run smooth and perform badlygooood stufffffff.
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Super unleaded gasoline has a higher octane than regular. This means that it is less likely to pre-ignite before it is intended to.
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What that means for the average car is that the engine is designed to run a certain octane level to get the most energy out of the gas and to keep engine damage from occurring. Some cars, high end and sports cars in particular, require super because the engine has been designed to get the most power out of the gas. Most of these have sensors that can detect detonation (pre-ignition) and can make adjustments to keep it from occurring. On these cars if you put in regular gas the computer basically detunes the engine a bit and you get a little less power and the mileage might go down a bit. On a car designed for regular gas if you put in super you do not get any gains because the computer was never set up to take advantage of it.
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On a side note in this cold weather some manufacturers have actually written service bulletins about using to high an octane gasoline causing starting problems. So the best advice I can give you is to just use what the car calls for.
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Octane rating in practical terms means the ability of gasoline to burn in a controlled manner rather than to explode. The higher the grade the slower gas burns. For low compression engines, you can get away with lower octane gas without detonation.This is a VERY general idea, and if you want more details - get a book.
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