Are You Using The Right Petrol Grade For Your Car?

Clearing Up Petrol Grade Misconceptions

There is a common misconception that the higher the grade of gasoline you pump, the faster your car speeds off.

But is that really the case?

Decoding Petrol Grades

Many drivers mistakenly believe that using a higher grade of gasoline will enhance their car's performance.

The truth is, most cars are designed to run efficiently on regular octane fuel.

Using a higher octane fuel does not necessarily improve mileage, speed, cleanliness, or overall operation of your car.

Follow Your Car's Recommendations

The best way to determine the appropriate petrol grade for your car is by consulting your owner’s manual.

It provides the manufacturer's recommendation for the optimal fuel grade.

Typically, regular octane is sufficient for most vehicles.

Despite this, many drivers opt for premium gas, which costs approximately 30 cents more per litre than regular gas.

This choice can lead to significant annual savings if avoided.

For instance, driving a standard 1.6-litre car for 20,000 km/year could save you around S$702 if you stick to regular gas.

When Higher Octane Fuel is Necessary

Higher octane gasoline is necessary only if your car's engine knocks on regular fuel.

Engine knocking is a rare occurrence in most vehicles.

However, certain sports cars and luxury models with high compression engines might require premium gasoline to prevent knocking.

Listen to your engine: if it doesn’t knock, you are using the correct petrol grade.

Understanding Octane Ratings

Octane is any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent.

The higher the octane rating, the slower the fuel burns when ignited during the compression burn cycle of the piston.

This controlled burning is crucial for high compression engines.

Ensuring the octane rating of your gasoline matches your engine’s design is essential for maximizing fuel economy and reducing emissions.

Myths About Higher Octane and Cleaning Additives

Contrary to popular belief, higher octane gasoline does not contain more cleaning additives than regular gasoline.

Government regulations mandate that all gasoline grades must have a similar amount of additives to clean injectors and valves.

Thus, regular octane fuel is just as effective in preventing engine deposits and cleaning your car's engine.

Switching to Higher Octane Gasoline

In rare cases, even when using the recommended octane, your car's engine may knock.

If this happens, try switching to the next highest octane grade.

Usually, upgrading to mid-grade or premium-grade gasoline will stop the knocking.

If the knocking continues after one or two fill-ups, your car may need a tune-up or other repairs.

Once the issue is resolved, revert to the lowest octane grade that your engine runs smoothly on.

The Drawbacks of Using Higher Octane Fuel

Opting for a higher octane fuel than necessary primarily benefits gasoline manufacturers.

Additionally, it can result in unburned fuel entering the emission system and accumulating in the catalytic converter.

Overworking this system can lead to breakdowns or suboptimal performance, often indicated by a rotten egg smell from the tailpipe.

If you notice this odor, switch back to a lower octane gasoline, and the smell should disappear after several tanks.

Is Engine Knocking Harmful?

Occasional light knocking is not harmful to your engine.

However, severe or persistent knocking can cause engine damage.

It's crucial to address any significant knocking issues promptly.

Conclusion

Choosing the right petrol grade for your car is about more than just price.

It’s about understanding your car’s needs and making informed decisions to ensure optimal performance and longevity.

Stick to the recommended fuel grade, and only switch to higher octane gasoline if necessary.

Writer's note: Images are purely fictional; for illustration only.