Can 98 Octane Gasoline Be Mixed with 95 Octane?
4 Answers
In theory, there is no problem, but it is recommended that car owners do not frequently change gasoline grades. Once a fuel type is selected, it is best to stick with it consistently and use the same type of fuel over the long term. Below is a related introduction to the differences between diesel and gasoline: 1. Volatility: Gasoline is volatile, while diesel is not. 2. Mixing with air: Gasoline mixes easily with air, whereas diesel does not. 3. Energy content: Under similar thermal efficiency conditions, diesel engines are more fuel-efficient. 4. Combustion method: Gasoline engines use spark plugs for ignition, while diesel engines do not have spark plugs. 5. Emission characteristics: The main emissions from gasoline are carbon monoxide, hydrocarbons, and nitrogen oxides, while particulate matter and nitrogen oxides are the primary emissions from diesel.
I think it's totally fine to use 98 octane gasoline in a car that originally requires 95! I often do this myself, especially during long highway drives. 98 octane has a higher rating and better anti-knock properties, making the engine run smoother with fewer strange noises and vibrations. However, 98 octane is usually more expensive, so unless you're after peak performance or your car is older and prone to knocking, 95 octane is perfectly fine. Just remember to check the owner's manual to confirm there are no special restrictions—some high-performance cars might have strict requirements, but most regular cars are fine. A money-saving and reassuring tip is that occasional mixing won’t hurt, but long-term use depends on your budget.
From both safety and daily usage perspectives, I can confidently state that using 98 octane gasoline in a vehicle designed for 95 octane is generally safe. The engine's design can accommodate slightly higher octane ratings without causing any damage, and it may even reduce the risk of knocking. However, this doesn't mean you should always do so, as 98 octane fuel is more expensive and offers poor cost-performance. It's advisable to first check your owner's manual for minimum requirements, and consult a professional repair shop if you have concerns. Don't overlook economic factors—unnecessary extra spending isn't wise. The golden rule for safe driving is: don't save big money only to invite small troubles. Sticking to the manufacturer's recommendation is always the safest approach.
My experience is that using 98 octane gasoline in a car designed for 95 is perfectly fine. Higher octane means better anti-knock properties, resulting in smoother engine ignition, especially during summer or mountain driving where it protects the engine. However, this doesn't mean you should switch long-term—95 octane suffices for daily use. Spending extra on 98 octane offers no practical benefit unless the manual specifies it's necessary. Simply put, it's a matter of choice and won't affect the car's condition.
