* Detonation (Knocking): High-compression engines are designed to squeeze the air-fuel mixture more tightly, leading to higher combustion pressures. Regular gasoline has a lower octane rating, meaning it's more susceptible to premature detonation (knocking). This can damage engine parts and reduce performance.
* Engine Performance: High-compression engines are optimized for higher-octane fuels, which burn more efficiently and produce more power. Using regular gasoline can result in a loss of power, reduced fuel efficiency, and rough engine operation.
* Manufacturer Recommendations: Car manufacturers specify the minimum octane rating required for their engines. Using lower-octane fuel than recommended can void your warranty.
However, there are some exceptions:
* Modern Engine Sensors: Newer cars often have knock sensors that detect detonation and adjust engine timing to compensate. In some cases, these sensors might allow the engine to run on lower-octane fuel without serious damage.
* Low-Compression High-Performance Engines: Some high-performance engines are designed for low compression ratios, even though they are powerful. These engines might be able to run on regular gasoline.
Bottom Line:
It's always best to use the fuel recommended by your car's manufacturer. Using higher-octane fuel than recommended won't harm your engine, but using lower-octane fuel can.
If you're unsure, consult your owner's manual or a trusted mechanic.
