Can You Add 92 Octane Gasoline After Filling Up with 95 Octane?
2 Answers
After filling up with 95 octane gasoline, you cannot add 92 octane gasoline. The specific reasons are as follows: 1. Normally, when the mixture of gasoline and air is about to combust in the engine, it is compressed into gas and then ignited by the spark plug to generate the power and energy needed for the car to operate. 2. The engine compression ratios for 95 octane and 92 octane gasoline are different. 95 octane gasoline is suitable for engines with higher compression ratios. If a higher compression ratio engine uses 92 octane gasoline, abnormal combustion will occur, leading to knocking. 3. Knocking not only damages the combustion chamber but also directly affects the normal operation of the engine, resulting in issues such as increased car noise, abnormal fuel consumption, and reduced driving power. In more severe cases, it may even cause engine damage.
I've just reviewed some materials, and this is actually quite particular. The difference between 95 and 92 octane gasoline mainly lies in the octane rating, where a higher number indicates better anti-knock performance. If your car recommends using 95 octane, it means the engine design requires high-octane fuel to prevent knocking risks. If you mix 92 octane after filling up with 95, it may lower the overall octane rating, leading to potential engine knocking or reduced efficiency over time. It's not absolutely forbidden—for instance, using 92 octane once in an emergency in remote areas is acceptable—but don't make it a habit. Otherwise, carbon buildup could increase maintenance costs. I suggest regularly checking the user manual or a mobile app for the recommended fuel grade. Sticking to the right fuel helps protect engine longevity and avoids unnecessary trouble, as repairs are far more expensive than refueling.
