Ruqayyah Snyder
Choosing the right engine oil for your car is important to ensure optimal performance and longevity. Engine oils are graded with numbers like 0W-30 or 10W-40, indicating their viscosity or thickness at different temperatures. The first number refers to the oil's viscosity at low temperatures, while the second number indicates its viscosity at high temperatures. It is essential to select an engine oil with the correct viscosity for your vehicle's engine, as using the wrong viscosity can lead to increased engine wear and reduced protection for internal components. You can find the recommended engine oil specifications in your car's owner's manual, which will also specify the type of oil to use, such as mineral, synthetic, or semi-synthetic, depending on factors like the climate, driving style, and car make.
| Characteristics | Values |
|---|---|
| Engine oil importance | Reduces friction and wear, absorbs heat |
| Choosing the right engine oil | Use the My Garage feature on the Supercheap Auto website, refer to the owner's manual, or check with the manufacturer |
| Engine oil viscosity | How thick or thin the oil is and how easily it flows at a certain temperature |
| Multi-grade oils | Thinner at cooler temperatures and thicker in high temperatures |
| Engine oil viscosity numbers | First number refers to the oil's cold-temperature characteristics, the second number refers to its viscosity when hot or at operating temperature |
| Engine oil viscosity examples | 0W-30, 10W-40, 20W-50 |
| Engine oil viscosity issues | Using the wrong viscosity can cause early wear and tear on moving parts |
| Engine oil changes | Necessary after a certain time even if the engine hasn't been run; more frequent changes may be needed in certain conditions like towing or racing |
| Engine oil types | Mineral, synthetic, and semi-synthetic |
| Engine oil type recommendations | Most modern cars: synthetic oil; turbo-diesel engines: semi-synthetic; older, classic cars: mineral |
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What You'll Learn
How to find the right engine oil for your car
Engine oil is crucial for keeping your car's engine in good condition. It lubricates the moving parts of the engine, reducing friction and wear, and helps to absorb and dissipate heat. Using the wrong type of oil can lead to engine problems, so it's important to select the right one for your vehicle.
The first step in finding the right engine oil for your car is to consult the owner's manual. The manual will specify the recommended oil viscosity, which is how thick or thin the oil is and how easily it flows at a given temperature. Viscosity is typically indicated by a number and a letter, such as "SAE 10W-40", with the first part of the number indicating viscosity at low temperatures and the second part indicating viscosity at high temperatures. The “W” stands for “winter”, not “weight”, as commonly believed.
In addition to viscosity, the owner's manual will also specify the type of oil recommended for your car. There are three main types of oil: mineral, synthetic, and semi-synthetic. Most modern cars use synthetic oil, while older cars may use mineral oil, and turbo-diesel engines often use semi-synthetic oil. The manual may also recommend oil based on service classifications such as the Association des Constructeurs Europeens d'Automobiles (ACEA) or Japanese Automotive Standards Organisation (JASO) standards, especially for European or Japanese cars.
If you don't have access to the owner's manual, there are other ways to find the right engine oil for your car. You can search for it online, contact a dealer that sells your type of vehicle, or use an online tool like the "My Garage" feature on the Supercheap Auto website, which allows you to enter your registration number to find the suitable engine oils for your car. You can also refer to the bottle of oil you used for your last oil change if you still have it.
It's important to keep in mind that engine oil requirements can vary depending on factors such as driving style, climate, and the age of your car. For example, if you're driving in extreme temperatures, you may need to use an oil that is better suited to those conditions, even if it differs from the manufacturer's recommendation. Additionally, it's a good idea to check your oil level regularly and keep a top-up bottle handy to ensure your engine always has the proper amount of oil.
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Engine oil viscosity ratings
Engine oil is crucial for optimal engine performance and longevity. The viscosity of an engine oil is its most important physical property. Viscosity is the measure of a fluid's resistance to flow, or how easily it pours at different temperatures. It is the thickness or thinness of oil at a certain temperature range.
The viscosity of engine oil is indicated by the two numbers on the bottle, such as 5W-30. The first number refers to the oil's viscosity at low temperatures, such as during engine start-up. The lower the number, the lower the viscosity, and the faster the oil will flow. The second number indicates the viscosity at normal engine temperatures. For example, 5W-20 will have a lower viscosity and provide less resistance than 10W-30 at both start-up and normal engine temperatures.
The Society of Automotive Engineers (SAE) tests oils for their ability to lubricate and flow at a predetermined temperature, rating them on a scale from 0 to 60. The viscosity index (VI) measures how viscosity changes relative to temperature changes. The higher the VI number, the less change in oil viscosity in relation to temperature. Motor oil with a high VI offers better engine protection.
It is important to use the correct engine oil viscosity for your vehicle. Engine oil requirements have become more complex as car manufacturers develop new ways to increase performance and reduce emissions. Modern engines are smaller and thinner, requiring lower viscosity oils to move through the thin engine pathways to protect and clean metal surfaces. Lower viscosity oils also result in better fuel economy.
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Engine oil classifications
The oil classification you’ll likely find in the manual is SAE, which stands for the 'Society of Automotive Engineers'. The SAE classification system uses two sets of numbers, such as "SAE 10W-30", with the first number followed by a "W". This "W" does not stand for "winter", despite common misconception, but instead for the "'Weight' of the oil, which refers to its viscosity or how fast it flows at a set temperature. The lower the number, the lower the viscosity and the faster it will flow.
SAE distinguishes 14 viscosity classes, including 6 winter grades (0W, 5W, 10W, 15W, 20W, 25W) and 8 summer grades (W8, W12, W16, W20, W30, W40, W50, W60). Winter grades are determined by the maximum viscosity at a given negative temperature, while summer grades are based on minimum and maximum viscosity at 100°C and minimum viscosity at 150°C.
In addition to SAE, another notable classification system is API, the American Petroleum Institute's quality classification. API categorises engine oils into two main types: gasoline engines (marked with the letter "S") and diesel engines ("C"). For example, if your owner's manual recommends API SN oil, an API SP oil will also provide full protection.
Other organisations that have developed their own classification systems include ACEA, the European Association of Automotive Manufacturers, and individual car manufacturers like Caterpillar, Mercedes-Benz, Ford, and Volkswagen.
It is important to use the correct engine oil classification and grade as specified by the manufacturer to ensure optimal performance and protection of your vehicle's internal components.
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How often to change your engine oil
The frequency with which you should change your engine oil depends on several factors. Firstly, the type of oil and transmission are important considerations. For example, synthetic oil can last longer than conventional mineral oil, typically requiring a change every 10,000-15,000 km or 12 months. The type of transmission also plays a role, with manual gearboxes needing an oil change less frequently than engine oil.
Secondly, your driving conditions and habits significantly impact the lifespan of your engine oil. Factors such as driving in dusty environments, towing trailers, and frequent stop-start driving can add strain to your engine, requiring more frequent oil changes. Additionally, driving style and fuel quality can affect oil change schedules, with high speeds, high RPM, and poor fuel quality increasing oil consumption and reducing oil pressure, respectively.
It's recommended to refer to your vehicle's service manual or owner's manual for specific guidelines on oil change intervals. These manuals provide information based on the make and model of your car, ensuring you maintain optimal performance and avoid engine damage. Newer cars may also have built-in oil-life monitoring systems that notify you when an oil change is necessary.
In general, it is suggested to change your engine oil every 7,000 to 15,000 km or every 6 to 12 months. However, it's important to consider the specific factors affecting your vehicle's performance and consult with a mechanic or service adviser if you have any concerns or unique driving conditions. Regular oil changes are crucial to maintaining the health of your engine and ensuring a safe driving experience.
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Engine oil types
Engine oil is crucial to the functioning of your car, as it lubricates the moving parts of the engine, reducing friction and wear. The oil also absorbs heat, which is then dissipated through an oil cooler or the sump. Choosing the right oil for your car can be tricky, as there are many different brands, types, and viscosities available. However, it is important to select the correct one to ensure your car runs at its full potential.
The first step in choosing the right engine oil is to consult your car's owner's manual. The manual will specify the recommended oil classification, oil grade, and viscosity for your vehicle. It will also indicate whether your car requires a petrol or diesel engine oil, which can be identified by the letters 'S' or 'C' respectively. Additionally, the manual may recommend engine oil based on service classifications such as the Association des Constructeurs Europeens d'Automobiles (ACEA) or Japanese Automotive Standards Organisation (JASO), especially for European or Japanese cars.
Another important factor to consider when choosing engine oil is viscosity, which refers to how thick or thin the oil is and how easily it flows at a certain temperature. The viscosity of the oil is indicated by the large numbers on the engine oil bottle, such as 10W-40 or 20W-50. The first part of the number (before the W) refers to the viscosity when cold, while the second part indicates the viscosity when hot. It is important to select an oil with the correct viscosity for your vehicle's engine, as using an oil that is too thick or too thin can lead to early wear and tear on the moving parts.
There are three main types of engine oil available: mineral, synthetic, and semi-synthetic. Most modern cars work best with synthetic oils, while turbo-diesel engines typically use semi-synthetic oils, and older, classic cars often prefer mineral oils. Synthetic oils tend to be more expensive than semi-synthetic and mineral oils, but they offer better cleansing, engine protection, and reduced engine wear.
It is important to regularly check your engine oil level and top it up as needed. This should be done even if your vehicle is not being used for heavy work. Additionally, it is recommended to change the oil filter periodically to ensure the health of your engine. When choosing a new engine oil, it is best to stick to the manufacturer's recommendations and consult a trusted mechanic if you have any doubts.
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Frequently asked questions
You can find the right engine oil for your car by using the My Garage feature on the Supercheap Auto website. Enter your registration number and search for Engine Oil to see the suitable products. Alternatively, you can check your owner's manual, which will list the oil classification and oil grade required for your vehicle.
The large numbers on the engine oil bottle, such as 10W-40, indicate the oil viscosity, i.e. how thick or thin the oil is and how easily it flows at a certain temperature. The first number refers to the oil's viscosity when cold, and the second number refers to its viscosity when hot. The letter 'S' denotes a petrol engine oil, while ''C' is used for diesel engine oils. The second letter indicates the quality of the oil, with ''A' being the lowest and progressing through the alphabet.
Even if the engine has not been run, oil can degrade over time and will need to be refreshed. If you are towing, driving in hilly areas or on dirt roads, racing, or carrying heavy loads, you may need to change your oil more frequently. It is recommended to check your oil regularly to ensure the levels have not dropped and top it up if necessary.
Most modern cars work best with synthetic oils, while turbo-diesel engines use semi-synthetic oils and older, classic cars prefer mineral oils.
