What are the symptoms of poor fuel quality?

[LondonLee]

Symptoms of poor fuel quality include: noticeably reduced vehicle power, more severely unstable idling, or even unexpected stalling; increased and rapid fuel consumption; long-term use can lead to carbon deposits and fuel residue, affecting the engine and fuel injectors. Below are related introductions: 1. Octane number: Gasoline grades are determined based on the octane number. The higher the octane number, the better the anti-knock performance. 2. Leaded gasoline: Gasoline containing lead components can cause oxygen sensor poisoning, clog the exhaust pipe and three-way catalytic converter, and reduce engine power. After using leaded gasoline, the spark plug insulator usually appears white or yellow. 3. Gum content: Gum content indicates the stability of gasoline. Excessive gum content can lead to deposits in the intake system or sticking of the intake valve. Generally, the unwashed gum content in gasoline before adding detergent should be below 30mg/100ml.