Solutions for filling your car with the wrong fuel are as follows: 1. Adding low-quality fuel is more severe than adding fuel with the wrong octane rating. Using substandard gasoline can degrade engine performance and damage components like pistons and fuel pumps. However, signs of using poor-quality fuel are often noticeable, such as valve noise or reduced power, which may indicate low octane fuel. If the engine struggles to start, suspect fuel contamination—excessive impurities, adulteration, or diluted gasoline. In such cases, do not force-start the engine; instead, contact a specialized auto repair shop or 4S store immediately. 2. Adding lower-octane fuel instead of higher-octane fuel: If the difference is minor (e.g., 97 to 93 or 93 to 90), the vehicle may exhibit reduced power and increased fuel consumption. No major engine damage occurs if this isn't prolonged. However, for significant differences (e.g., 97 to 90), drain the fuel tank before starting the engine and arrange for a professional cleaning of the tank and fuel system. 3. Adding gasoline to a diesel engine: The engine may start initially but quickly lose power. After driving, unusual noises, unstable idling, and white exhaust smoke may appear. If detected early, replacing the fuel without further engine adjustments may suffice. 4. Adding diesel to a gasoline engine: This is more serious. Since gasoline and diesel combust differently, symptoms like engine shaking, black smoke, or failure to start may occur. Continued use can damage the entire fuel system or even destroy the engine. If this happens, immediately contact a repair shop to clean the tank and fuel system, followed by a full engine inspection. Avoid ignition to prevent further damage. Note: Such damage is typically not covered by insurance.
