Using cheaper AI-92 in winter is a mistaken practice that does not help start the engine and can lead to breakdowns. This was reminded by Konstantin Ershov, a representative of the Fit Service service center.
He explained that AI-92 gasoline does have a higher volatility: it consists of light hydrocarbon fractions that more quickly form vapor and form a combustible mixture even in severe frost.
In theory, this makes it easier to start "cold", but in reality it does not make the 92nd a universal winter fuel.
The octane number is also an indicator of detonation resistance: the ability of a fuel not to self-ignite under pressure. It does not say anything about the purity of the fuel, the quality of the additives, or how the fuel behaves in freezing temperatures. Therefore, lowering the octane number for an easy start in winter is wrong.
According to the specialist, an easy start depends on the freshness and quality of the fuel, a working ignition system and car maintenance. If the manufacturer requires AI-95, then switching to AI-92, even in severe frost, carries the risk of premature repair.
