Can a Car That Requires 98 Octane Use 95 Octane Fuel?
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If a car requires 98 octane gasoline, it should not use 95 octane fuel. Using 95 octane fuel can cause engine knocking, which affects the engine's power output and fuel economy. To avoid knocking, it is essential to use the correct octane rating. Below is more information about gasoline: 1. Different octane ratings indicate varying levels of octane numbers, which determine fuel stability. Higher-octane gasoline has greater stability, reducing the likelihood of engine knocking. 2. During the compression stroke in an engine, the piston moves upward, compressing the air-fuel mixture. This compression increases temperature and pressure. If the gasoline's stability is poor, the mixture may ignite prematurely, causing knocking. 3. Knocking occurs when the ignited mixture pushes the piston downward while it is still moving upward, negatively impacting engine performance and fuel efficiency. Severe knocking can even lead to connecting rod deformation or piston damage.