Why do turbocharged engines require 95-octane gasoline?
2 Answers
Turbocharged engines require 95-octane gasoline because they have a high compression ratio, which necessitates the use of higher-octane fuel. 95-octane gasoline is composed of 95% isooctane and 5% n-heptane. Gasoline is a volatile, flammable hydrocarbon mixture liquid derived from the distillation, cracking, or pyrolysis of petroleum and is used as fuel. Turbocharging is a technology that utilizes the exhaust gases from an internal combustion engine to drive an air compressor, thereby increasing the engine's air intake and consequently enhancing its power and torque. Turbocharging systems are categorized into constant-pressure turbocharging systems and pulse turbocharging systems.
I've been driving a turbocharged car for several years and always stick to 95-octane gasoline. Turbocharging increases the engine's compression ratio and boosts power, but using lower-octane fuel like 92 can easily cause knocking. What's knocking? It's when the fuel ignites too early or too violently in the cylinder, sounding like a knocking noise, and over time it can damage internal components like pistons and valves. Repairs can cost thousands, which isn't worth the savings. 95-octane fuel has a higher octane rating, meaning better anti-knock properties, ensuring more stable combustion and smoother engine operation. Beyond protecting the engine, it also slightly improves fuel efficiency, saving money in the long run. It ensures safe and reliable daily driving, avoiding breakdowns—I never risk saving a few bucks at the pump. In short, I recommend following the manual and not cutting corners to save small amounts.
