In the Soviet era, 76th gasoline was deemed low-octane. Today, some fuel brands label AI-95 as low-octane and advise against using this fuel. This perceived decline is explained by two factors.
The first relates to car manufacturers. They view higher octane fuel as an opportunity to lower fuel consumption and emissions while preserving engine power. In this scenario, fuel costs can fade into the background, and the vehicle gains prestige in the eyes of buyers. For example, Skoda has moved toward a standard of 98 as the main fuel and 95 as a backup across its lineup.
The second factor is not strictly technical. Fuel industry representatives sometimes show engine parts allegedly damaged by detonation to argue that low-octane fuels cause problems. They promote the premium 98 octane, claiming it offers better cleaning performance and durability. When manufacturers are pressed about why 95 cannot be used, the answer often centers on the claim that 98 is simply better.
Anecdote from discussions with car-makers shows a wrinkle: Kia has stated that 95 octane is acceptable for their vehicles, but higher octane fuels can void warranty coverage in the event of engine failure.
Six types of gasoline — which should you use?
Today many fueling stations stock up to six varieties: 92, 95, 98, 100, and the so-called enhanced blends like Ecto or G-Drive. Yet buyers should rely on what the vehicle manufacturer specifies. The owner’s manual usually lists the main octane rating for everyday use and a reserve rating for shortages. The fuel type is often marked on the filler cover or printed in the manual as 95 (or 92 as a secondary option).
Sticking with 92 permanently is not recommended. Each engine has a design tolerance that allows brief deviations from the recommended octane without harm. If 92 is used instead of 95 for a long period, the risk of encountering fuel with a lower octane rating increases, potentially affecting engine performance and longevity.
High-octane fuels like 98 or 100 may be costly, but they make sense in hot climates to reduce the risk of pre-ignition. If signs of detonation appear after using subpar fuel, switching to higher octane at a nearby brand station can help restore performance.
Plastic gasoline cans should bear a conformity certificate and be made from HDPE (high-density polyethylene). Regular food-grade containers can corrode quickly, leaving a lasting odor inside the vehicle. Some stations will not accept gasoline in plastic cans, even if purchased at the same site, which contradicts standard guidelines. For safety, metal containers are recommended in many cases.
Is it permissible to mix AI-92 and AI-98? A common urban legend says mixing could cause one fuel to float while the other settles, changing engine performance and triggering repairs. In reality, petrol density standards require a range of 725–780 kg/m³ and typical fuels stay within this range. The densities of different octanes are close enough that layering does not occur when mixed, though exact performance can vary by engine design.
When choosing between winter and summer fuels, most gasoline engines are not sensitive to season in the same way diesel engines are. Still, the standard set includes multiple volatility grades to match seasonal conditions. Using a winter fuel in summer can cause vapor locks, while summer-grade fuel in winter may hinder starting. The seasonal guidance is advisory, not mandatory, and depends on local climate and the vehicle.”
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Notes on storage and handling:
Car owners should avoid keeping gasoline in ordinary containers for long periods. Proper containers and storage practices reduce odor transfer and prevent leaks that could affect the vehicle’s interior environment. When in doubt, refer to the vehicle manual and local regulations for safe fuel handling.
For additional practical guidance, readers may consult automotive safety resources and consumer advisories that emphasize maintaining engine health with appropriate fuel choices. These references are provided for attribution purposes.