Rajan Wilcox
Choosing the right fuel for your car can be confusing, with many different types of fuel available at varying prices. The most suitable fuel for your car will depend on the type of engine it has. The owner's manual or the inside of the fuel cap should tell you the manufacturer's recommended choice of fuel. It is important to follow these instructions as using the wrong fuel can cause engine damage or even write off your car.
| Characteristics | Values |
|---|---|
| Fuel type | Petrol, diesel, liquefied petroleum gas (LPG) or autogas |
| Petrol types | Regular unleaded petrol (RULP), premium unleaded petrol (PULP), E10, E85 |
| Octane ratings | 91, 95, 98 |
| Fuel efficiency | Higher octane fuel may improve fuel efficiency |
| Engine damage | Using the wrong fuel can cause engine damage |
| Fuel recommendations | Check the owner's manual, the label on the fuel cap, or the vehicle handbook |
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Unleaded fuel only
If your car's fuel cap says 'Unleaded Fuel Only', you can use Standard Unleaded Petrol 91 or E10. E10 is a mix of up to 10% ethanol and is the cheapest by the litre at the pump. However, if you have an older vehicle, you should avoid using E10 as it can clog your fuel filter and injectors.
If your car doesn't specify a particular fuel and instead reads 'Unleaded Petrol Only', you can choose to go premium. Running E10 will save you money per litre, but fuel efficiency may be lower, which could lead to more visits to the petrol station. This varies for every car, and in some cases, premium unleaded may achieve better fuel efficiency and performance.
If your car is compatible with E10 fuel, you can use it. However, if your car isn't compatible with E10, you'll need to run on super-unleaded. The government has an E10 compatibility checker that will tell you if your car is suitable for the fuel.
As a general rule, you can use a higher-octane fuel than is recommended for your car, but using a lower-octane fuel than recommended could cause engine damage. You can also check your car's dashboard for icons indicating the fuel type, and some will even display the words 'diesel' or 'gas' during ignition.
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Premium unleaded only
If your car requires premium unleaded fuel only, it is important to understand the reasons behind this specification and how to ensure optimal performance and maintenance for your vehicle.
Premium unleaded fuel, also known as high-octane fuel, is a type of gasoline that has a higher octane rating than regular unleaded fuel. The octane rating is a measure of the fuel's resistance to premature ignition, also known as knocking or pinging, which can damage the engine. By using premium unleaded fuel, you can help prevent engine knock and improve the performance and fuel efficiency of your vehicle.
Vehicles that require premium unleaded fuel are typically high-performance cars with powerful engines. These engines are designed to operate at higher compression ratios and may have features such as turbocharging or supercharging, which increase the air pressure in the engine cylinders. As a result, these engines require fuel with a higher octane rating to prevent knocking and ensure proper performance.
To ensure optimal performance and maintain the health of your engine, it is important to always use premium unleaded fuel as specified by the manufacturer. Filling your car with regular unleaded fuel may result in reduced performance, decreased fuel efficiency, and potential engine damage over time. Additionally, it is recommended to maintain a good fuel injection system and clean fuel injectors to maximize the benefits of using premium unleaded fuel.
By following the manufacturer's recommendations and using premium unleaded fuel, you can help ensure that your car performs at its best and maintains its longevity. Regular maintenance and the use of appropriate fuel are key factors in keeping your vehicle in top condition.
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Octane ratings
High-octane fuel is currently marketed as 'premium'. Automotive manufacturers have expressed interest in raising the minimum octane pool to enable smaller, more efficient engines. This would increase vehicle efficiency and lower greenhouse gases through decreased petroleum consumption.
The use of higher octane fuels enables higher compression ratios, turbocharging, and downsizing/downspeeding, all of which enable greater engine efficiencies and higher performance. It is recommended to fill high-performance cars with higher octane fuels, such as 98 premium unleaded petrol, as these cars are more likely to burn fuel consistently at higher temperatures than regular cars. However, regular passenger cars that don't have high-performance requirements should be fine running on regular unleaded.
It is not recommended to use a lower octane fuel for your car, as you may experience a drop in performance and fuel economy, and potentially even damage the engine. This is due to the fuel not properly combusting when it should, which throws off the timing in the engine, causing it to ''knock' or 'ping'.
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Diesel engines
Misfueling a diesel vehicle with gasoline can cause severe damage to the engine and fuel system. Therefore, it is important to correctly identify whether your car runs on diesel.
One of the easiest ways to tell if your car runs on diesel is to check for stickers on the car key, dashboard, fuel filler neck, fuel gauge, or inside the fuel cap. These will often explicitly state the required fuel type, such as "Diesel Only". Alternatively, the car's model name may contain letters that indicate a diesel engine, such as 'D', 'TDI', 'HDi', 'GTD', 'dCi', or 'JTD'. For example, a Volkswagen Golf TDI indicates a Turbocharged Direct Injection diesel engine. However, this is not always a reliable indicator, and it is recommended to refer to other sources of information as well.
Other ways to identify a diesel engine include checking the rev meter, which typically starts at a lower RPM than gasoline cars, and looking for a glowplug indicator, which is supposed to light up when you ignite a cold diesel engine. Additionally, diesel cars tend to sound and feel different from gasoline cars, and you can always refer to the car's owner's manual or contact the manufacturer's helpline for confirmation.
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Engine damage
To avoid engine damage, it is crucial to ensure that your car is taking the correct type of fuel. Using the wrong fuel can lead to serious issues and costly repairs. Here are some important considerations to keep in mind:
Diesel vs. Gasoline
One common mistake is mixing diesel and gasoline. Diesel fuel should not be used in a gasoline car, as it can cause clogging and damage to the engine's components. Gasoline engines are designed to use thinner, less viscous fuel, and diesel's thicker consistency can lead to issues. If you accidentally put diesel in a gasoline car, do not start the engine. Contact a dealership or repair shop to drain and clean the tank.
Octane Ratings
Different vehicles have specific octane requirements. Octane rating refers to the fuel's stability and resistance to misfiring or "knock." Using a low-octane fuel in a car that requires high-octane fuel can cause engine damage due to premature combustion. Always refer to your owner's manual or the information near the gas cap to determine the recommended octane rating for your vehicle.
Fuel Type
Using the correct fuel type, such as unleaded or premium, is essential. While using premium fuel in a car that doesn't require it may not provide additional benefits, using regular fuel in a car that specifies "premium fuel required" can lead to potential engine damage. Again, consult your owner's manual or the information provided by the manufacturer to make sure you're using the right fuel type.
Fuel Quality and Age
Using contaminated or degraded fuel can also damage your engine. Over time, gasoline can lose its combustibility and become contaminated by factors such as moisture, dirt, or rust. It's important to use fuel stabilizers and properly store your vehicle to maintain fuel quality. Additionally, when purchasing fuel, ensure it is from a reputable source to avoid contamination incidents that have occurred in the past.
Foreign Substances
Introducing foreign substances into the fuel tank, such as water, sugar, or bleach, can cause significant engine damage. These substances can corrode and rust engine components, leading to costly repairs or even engine replacement. It is crucial to only use the recommended fuel type and avoid any foreign additives.
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Frequently asked questions
You can find out which fuel your car takes by checking the owner's manual or looking inside the fuel cap. If you see "Unleaded Fuel Only", your car takes standard unleaded petrol (ULP) with an octane rating of 91. If you see "Premium Unleaded Only", your car takes premium unleaded (PULP) with an octane rating of 95 or 98.
Premium unleaded has a higher octane rating than regular unleaded, which means it can improve engine efficiency and reduce engine knocking or pinging. However, it is more expensive and may not provide any noticeable benefits for cars that don't require it.
Yes, you can use a higher octane fuel than what is recommended for your car. However, you may not notice any difference in performance and it will cost you more.
If you put the wrong fuel in your car, do not start the engine. Call a mechanic or your car manufacturer's helpline for assistance.
