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It’s quite often you see these cryptic numbers on your engine oil bottle. These numbers are simply too important to neglect. For instance, “15W 40 engine oil” means a multi-grade oil governed by SAE standards. The numbers 15W and 40 mention the oil’s viscosity developed by SAE J306 (a single-grade oil standard). In simple terms, 15W-40 will have the same viscosity as 15W oil during cold temperatures. At a high temperature, the oil will have the same viscosity as SAE 40 engine oil. To understand more, read on.


To understand these engine oil numbers, we have to understand the standards set by the Society of Automotive Engineers (SAE) for engine oil viscosity. The scale starts from 0 and ends at 60. The number with the letter “W'' ranges from 0 to 25. Viscosity is a measure of the oil resistance to flow or in simple terms, its thickness. Oil with higher viscosity is thicker and takes time to flow in the engine compared to lower viscosity fluid. Thick viscosity oil is used in places when there's a high temperature, as during that time the oil viscosity drops, and the oil thins. The engine oil is made up of base oil (95%) and additives (5%). The oil additives are chemical compounds that are added to the fluid to improve its performance. When additives are added to the base oil, it lets the single oil act thinner in cold temperatures and a thicker oil in warm temperatures, thus, the name multi-viscosity oil.

The standard for measuring oil viscosity is developed by the Society of Automotive Engineers (SAE) and the American Petroleum Institute (API). For instance, the oil with viscosity grade 15W-40 acts like 15W at a low temperature (W= Winter) and the number 40 at a higher temperature.

By comparing two viscosity grades at a given operating temperature, 5W-40 and 15W-40, we understand that both these numbers have the same viscosity, but one is not thinner and has a lower viscosity than the other. Both have a viscosity grade of 40. If you use 5W-40, it will have a lower viscosity than 15W-40. Similarly, the 5W-40 oil will lubricate the engine quicker in the cold temperature than the 15W-40 engine oil.


Now that you’ve understood how to read the oil viscosity, we will go ahead and suggest the best place to buy. If you are looking for 15W-40 engine oil, Carorbis is the one-stop-shop for all your requirements. We offer a premium 15W-40 engine oil from several recognized brands to extend the engine life and protect against the wear and tear of rocky roads, drastic weather, and heavy tows. The oil is equipped to offer superior protection, cleanliness and greatly extend the vehicle service life.

It’s vital to take proper measures to extend your vehicle engine life and save it from costly repair. Investing in high-quality and reliable engine oil is a significant move to ensure the long-lasting service of your vehicle. Poor quality engine oil will not only contaminate the internal components of the engine but also expose it to a higher risk of permanent damage. If you are looking to buy the best engine oil, then Carorbis is the best place to be. We have a wide collection of premium engine oils from several trusted brands worldwide. Get budget-friendly 15w 40 engine oil price than any other online platforms.

You don’t need to spend tons of money on buying a decent bottle of engine oil that does a bare minimum to your vehicle. Rather invest in a premium quality engine oil at the affordable range at Carorbis. Limit your trips to mechanics, or vehicle shops, get the best engine oil with a simple click at the comfort of your home. We offer FREE delivery charges for purchases above INR 500. You can also stick to cash on delivery by paying a minimum charge of INR 40. Go ahead and shop from multiple International brands at a budget-friendly price at India’s biggest online aftermarket platform.

Frequently Asked Questions

Q 1. What is 15W-40 oil used for?

Ans. 15W-40 engine oil is used for diesel-based trucks, farm tractors, light trucks, turbo-charged diesel engines, farm tractors, and other gasoline engines.

Q 2. What is the difference between 10W 40 and 15W-40 engine oil?

Ans. When comparing these two oils, 10W 40 will be thicker than 15W40 in cold temperatures but shares the same viscosity at a higher temperature. The number “W” dictates the oil performance during winter. While the last number indicates that the cold oil will be thinner in hot temperature.

Q 3. Is 15W-40 oil only for diesel engines?

Ans. Yes, 15W-40 engine oils are mostly suitable for diesel engines. The added additives in the oil particularly help diesel engines but are also useful to gasoline-powered engines.

Q 4. Can I use SAE 40 instead of 15W40?

Ans. It’s actually the same. If your vehicle asks for 40SAE then 15W-40 is also suitable. 15W-40 is 40 SAE, the 15W in the number stands for winter, not for weight. It means that the oil is multi-grade, useful in different temperatures. The oil expands and thin when used at a hot temperature and shrinks when utilized at cold temperature.

Q 5. Can I use 10W 30 instead of 15W40?

Ans. 10W-30 engine oil is a lot thinner than 15W-40 oil, thus, these oils can’t be used interchangeably. 10W-30 oil will have a weaker film strength and be highly prone to oxidation. You will require high-quality additives added in 10W-30 to compensate for the weakness and exhibit the same performance and lubrication of 15W-40 engine oil.

Q 6. Can I use 15W-40 for gasoline and diesel engines

Ans. Yes, 15W-40 is suitable to use for gasoline and diesel engines.

Q 7. Will 15w40 hurt a gas engine?

Ans. No! 15W-40 is suitable for diesel engines and has several ranges of added additives in it. It is also ideal for gasoline engines.

Q 8. Can I use 15W40 on my motorcycle?

Ans. Yes, you can use 15W-40 engine oil on your bike. However, make sure the temperature is not higher than 40-degree.

Q 9. Where to buy 15w-40 engine oil?

Ans. You can buy premium 15W-40 engine oil at Carorbis at the most affordable price.

Q 10. What happens if you use 15w40 instead of 5w40?

Ans. Although both these oils have a viscosity grade of 40 . It’s not ideal to use them interchangeably during the winter. The 5W-40 engine oil has a lower viscosity compared to 15W-40. It will be much thinner and lubricate the engine quickly than 15W-40, thus, it’s not ideal to use 15w-40 instead of 5W-40 during winters as it can cause severe damage to the engine’s internal components.