When you pump petrol in your car, it's more than just figuring out which octane to use. Sometimes it's about sourcing for the best fuel prices or even the types of petrol credit cards you use at different petrol stations.
Category: Car Ownership Advice
It is understood that choosing the right kind of petrol for your vehicle is crucial. While inexperienced drivers might base their decision on petrol costs alone, one must consider the car's fuel efficiency, performance, and vehicle requirements.
Types of petrol in Singapore
In Singapore, there are three distinct types of fuel aside from diesel - 92-Octane, 95-Octane, and 98-Octane.
The numbers correspond to the octane ratings of the petrol, which indicates the fuel's stability in general.
A higher-octane rating would suggest that the fuel is more stable. This stability refers to the fuel's resistance to pre-ignition, with higher stability indicating a lesser likelihood of pre-ignition.
What is pre-ignition?
In normal combustion, the flame front originates at the spark plug and travels outward evenly and steadily throughout the combustion chamber. Theoretically, perfect combustion burns up all the air and fuel in the cylinder, leaving nothing behind. The heat is then transferred from the flame front to the piston, the piston to the cylinder wall, and the coolant system.
On the other hand, pre-ignition occurs when something, such as burning carbon embers, glowing hot or melted spark plus or exhaust valves, ignites the air/fuel mixture in the engine during the compression stroke, resulting in engine failure, melting of spark plugs and melted holes in pistons.
The occurrence of pre-ignition makes a loud knocking noise, which can damage the car's engine pistons and cylinder walls which are crucial to the vehicle and are costly to fix or replace.