Can I Use 95 Octane Gasoline After Using 98 Octane?
2 Answers
Yes, you can use 95 octane gasoline after using 98 octane, but you should first use up the 98 octane gasoline before refilling with 95 octane. Gasoline is a volatile, flammable hydrocarbon mixture liquid derived from the distillation, cracking, or pyrolysis of petroleum, used as fuel. It appears as a transparent liquid, primarily composed of aliphatic hydrocarbons, naphthenic hydrocarbons, and a certain amount of aromatic hydrocarbons. Notes on refueling: 1. Refuel in the morning or evening when temperatures are relatively lower, as the same volume of gasoline can have a higher mass; 2. Avoid filling the tank completely when driving in the city, as this can increase engine load; 3. Do not wait until the tank is empty before refueling, as insufficient fuel can prevent the fuel pump from being submerged, reducing its lifespan; 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.
The gasoline octane rating represents the fuel's resistance to knocking, with 98-octane being higher than 95-octane. It is generally acceptable to switch from 98 to 95 because modern engines equipped with ECUs can automatically adjust ignition timing to prevent knocking and engine damage. However, this is not ideal. High-compression engines are designed for higher-octane fuel, and downgrading may cause slight power loss or occasional irregular ignition, potentially affecting long-term performance. Always consult your vehicle's manual—if it specifies 95 as the minimum, switching from 98 to 95 is fine. If 98 is required, occasional mixing is harmless but avoid long-term use. Economically, using 95-octane saves money, but never compromise your vehicle's health.
