What happens if you fill a car that requires 95 octane with 98 octane fuel?

[Elijah]

Occasionally filling a car that requires 95 octane with 98 octane fuel will not cause any issues, but doing so long-term can severely affect the normal operation of the engine, leading to knocking. In serious cases, it may reduce the engine's lifespan and increase maintenance costs. Precautions for refueling include: 1. Refuel in the morning or evening when temperatures are relatively lower, as the same volume of gasoline will have a higher mass; 2. When driving in the city, avoid filling the tank completely, as this increases the engine's load; 3. Do not wait until the car is completely out of fuel to refuel, as too little fuel can shorten the lifespan of the fuel pump; 4. Avoid refueling during thunderstorms, as the fuel nozzle might introduce stray currents into the fuel tank, increasing the movement of unstable gasoline molecules and posing fire or explosion risks; 5. Avoid mixing different grades of gasoline.