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Reply to "Wrong grade of gas in car "
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[quote=Anonymous]It’s probably fine. The deal with higher octanes is that they have higher ignition points, which makes them less likely to ignite on the cylinder’s compression stroke. The fuel air mixture is supposed to ignite when the spark plug fires. However, if the compression of the fuel air mixture is such that it’s enough to raise the temp of the mixture high enough (Ideal Gas Law), then you can get pre ignition BEFORE the right time, and that pre-ignition is momentarily working against you. That’s called knocking. However, modern cars are supposedly designed to be able to adjust for that so you you don’t get the premature ignition. You may not get optimal performance, but it shouldn’t harm it.[/quote]
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