Should Borgward cars use 92 or 95 octane gasoline?
2 Answers
If it is a naturally aspirated engine, 92 octane gasoline is required, while a turbocharged engine requires 95 octane gasoline. When refueling, you can check the manufacturer's recommended gasoline grade on the fuel tank cap. It is essential to choose the correct gasoline grade for your vehicle. Below are the relevant details: 1. Most turbocharged engines require the use of 95 octane gasoline because the temperature and pressure inside the cylinders of turbocharged engines are relatively high during operation. Using lower-grade gasoline can easily cause engine knocking. 2. Knocking is an abnormal combustion phenomenon in the engine, which can be quite harmful. Severe knocking can even lead to connecting rod deformation or piston cracking. Higher-grade gasoline has a higher octane rating, and gasoline with a higher octane rating is more stable. 3. Knocking occurs during the engine's compression stroke. During this stroke, both the intake and exhaust valves are closed, and the piston moves upward to compress the air-fuel mixture. When compressed, the temperature and pressure of the mixture increase. If the gasoline is not stable enough, the mixture may ignite prematurely. The burning mixture pushes the piston downward while it is moving upward, which can negatively affect the engine's power output and fuel economy.
I remember when driving the Borgward BX7, using 95-octane gasoline was always the most reliable choice. With its higher octane rating, 95-octane fuel reduces the risk of engine knocking and protects internal components. When I first bought the car, I tried 92-octane fuel and occasionally noticed slight engine vibrations. After switching to 95-octane, the engine ran much smoother with quicker throttle response. The difference was even more noticeable during long summer drives—engine noise decreased and fuel consumption remained stable. Using the wrong fuel long-term may lead to rust or carbon buildup, resulting in costly repairs. I recommend owners observe their car's performance for a few days after refueling. If acceleration feels smooth, it means the fuel is suitable. Borgward generally recommends 95 RON, which is clearly indicated on the fuel cap or in the manual.
