Is Sae30 the Same as 10w30, Can You use BOTH?

There are two types of motor oil commonly used in today’s vehicles: single-grade and multi-grade. So, which is the right type of oil for your car?

The answer depends on a few factors, but typically, single-grade oil is best for older cars while multi-grade oil is better suited for newer vehicles. Here’s a closer look at the key differences between these two types of motor oil:

  • Single-grade oil is just that – a single viscosity, or thickness. This type of motor oil was once the norm for all vehicles. However, as engines have become more sophisticated, they require oil that can maintain its viscosity over a wider range of temperatures. That’s where multi-grade oil comes in.
  • Multi-grade oil contains two viscosities – a lower viscosity for cold start-ups and a higher viscosity for high temperatures. The advantage of multi-grade oil is that it can maintain its stability across a wider range of temperatures, which is better for your engine.

So, which type of motor oil should you use in your car? If you have an older vehicle, single-grade oil may be the best option. However, if you have a newer car, multi-grade motor oil is probably the way to go.

But is sae30 the same as 10w30?

The viscosity of an oil is tested at two standard temperatures: 40 and 100 degrees Celsius.

10w30 is more fluid than SAE 30. The value of 30 indicates that it shares the same viscosity as its counterpart oil when the engine is warm. However, because it is less dense, it will never thicken as SAE 30 when the temperatures are too low.  10w30 has a viscosity of 10w, allowing it to begin protecting engine components at a lower temperature.

Single-grade vs Multi-grade motor oil

Single-grade motor oils are formulated to meet the requirements of a specific viscosity grade, such as SAE 30, 40, or 50. Multi-grade motor oils are formulated to meet the requirements of multiple viscosity grades, such as SAE 5W-30 or 10W-40.

Multi-grade oils are designed to flow like a lower viscosity oil at low temperatures and like a higher viscosity oil at high temperatures. This means that they can provide better protection for your engine in a wider range of operating conditions than a single-grade oil.

If you live in an area with cold winters, a multi-grade oil is a good choice for your car. The W in the oil’s name stands for winter. The number following the W indicates the oil’s low-temperature viscosity. The higher the number, the thicker the oil and the better it will flow in cold temperatures.

For example, a 10W-30 oil flows like a 10-weight oil at 0°F (-18°C) and like a 30-weight oil at 212°F (100°C). A 10W-40 oil flows like a 10-weight oil at 0°F (-18°C) and like a 40-weight oil at 212°F (100°C).

Single-grade oils are not as common as they once were. Many carmakers now recommend or require the use of a multi-grade oil. Check your car’s owner’s manual to see what kind of oil it recommends.

If you are not sure which oil to use, ask your mechanic or consult your car’s owner’s manual. You can also check the API (American Petroleum Institute) website to see if a particular oil is recommended for your car.

What Is SAE 30?

SAE is the acronym for Society of Automotive Engineers. They created a categorization model based on the viscosity of the oil that everyone uses. Typically, motor oil has a viscosity value from 0 and 50.

SAE 30 motor oil is a type of light duty motor oil. It is commonly used in small engines, such as those found in lawn mowers , snow blowers, small tractors as well as other other garden tools. It has a viscosity of 30, which means that it is thicker than water but thinner than most other motor oils.

SAE 30 oil is made from a base oil that is derived from petroleum. It also contains additives that help to improve its performance. These additives can include things like additives, anti-foaming agents, and antioxidants.

What is 10w30?

Again, 10w30 is a multi-grade oil since it has two distinct viscosity classifications dependent on temperature.

10w30 is a multi-grade engine oil excellent for heavy-duty engines due to its capacity to withstand high temperatures for long periods of time without affecting engine performance.

The viscosity rating of this motor oil is 10 at cold temperatures and 30 at high temps. This motor oil boasts a low viscosity at cold temperatures, meaning that it is thin at low temperatures.

This lubricating oil meets all API SN standards. The American Petroleum Institute introduced the API SN engine category and

The oil controls sludge more effectively. This indicates that this oil does not produce sludge or gel at high temperatures. Additionally, it is compatible with after treatment.

In accordance with the European Automobile Manufacturers Association, 10w30 motor oil should have an ACEA A3/B3 or A3/B4 rating . The EAMA tasked with assigning oil sequences to various engine oil.

10W-30 is capable of withstanding higher temperatures without affecting engine performance. In addition to functioning effectively under hot temperature and pressure conditions in hot places, the motor oil adheres to the engine parts without thinning.

It is suited for heavy-duty diesels because to its much thicker and has a high load-carrying capacity.

This oil protects engine deposits from accumulating onto engine components such as pistons. Additionally, it reduces engine damage due to friction and inadequate lubrication.

In addition to these keyl features, other features include:

  • Reduces oil consumption in heavy-duty diesel and gasoline engines
  • Better fuel efficiency and improved fuel economy.
  • Better sludge control
  • Decreased wear and tear Anti-rust and corrosion protection
  • Due to its increased viscosity, provides a quiet, smooth operation.
  • The oil is also ideal for other engines using advanced fuels, e.g. biofuel.

Is sae30 the same as 10w30?

Although both SAE 30 and 10w30 are often used in motor vehicles, they are not identical. Viscosity is the primary difference between the two oils.

This indicates that their flows are distinct when subjected to increasing and dropping temperatures. SAE 30 is dense.

It will not flow at the very same velocity as the other. 10w30 is thinner despite its same performance at high temperatures.

To illustrate this in further detail, let’s discuss how motor oils are categorized.

First, examine the “30” that appears in both motor oils. This figure indicates the standard viscosity measurement at 100 degrees Celsius established by the Society of Automotive Engineers (SAE). When heated, both SAE 30 and 10w30 share a viscosity grade of 30.

Next, let’s discuss the “10w”. This is yet another viscosity grade. However, it is classified as cold conditions (“w” for winter). This indicates that 10w30 has distinct viscosity ratings for hot and cold conditions.

Based on this information, we may conclude that SAE 30 is a single-grade oil. This is because its thickness is only measured once when hot.

In contrast, 10w30 oil is regarded as a multi-grade oil. It will have a viscosity grade of 10 at cold (winter) temperatures and a viscosity grade of 30 while heated. This is performed by altering the characteristics of the oil with oil additives. Still curious about the distinctions between SAE 30 and 10w30? I will discuss a few of their primary traits below.

SAE 30 and 10w30 Oil Key Differences

While these two motor oils share some similarities, they are utilized differently in several ways. Each possesses qualities that make them more suitable than the other.


Many motor oils contain chemicals and additives that capture dirt and clean the engine of sludge between oil changes. Some automobile owners dislike additives because they believe they do more damage than good. If the oil is not labeled as detergent-free, it likely contains additives.

Operating Temperature

The hot viscosity of SAE 30 has been evaluated. This implies that, while it may operate in your car during cold weather, no testing have been conducted to confirm this. It will attain its maximum viscosity at around 212°F; however, it will break down between 250-260°F. The engine will overheat beyond that limit, and the oil will need to cool.

SAE 30 has a poor profile for cold weather conditions. During the warmer months, its optimal use.

Performance Overall

The majority of SAE 30 users are satisfied. It is a bit more expensive, but it will safeguard your engine even after prolonged exposure to high temperatures.


SAE30 has a viscosity of thirty. This indicates that it flows adequately in the ordinary automobile or truck during warm or hot weather. It is resistant to the engine’s increasing temperature. And it will help protect it against the friction created by its moving elements.

Oil Pressure

SAE 30 oil is highly resistant to pressure. It has undergone extensive testing in temperatures as high as 104°C.

Cost per Quart on Average

As with any goods, the brand signifies a substantial portion of the price. It may also reveal much about the quality. Conduct a thorough investigation if it’s manufactured by a brand you’ve never heard of. There is a price range of $10 to $15 for a quart produced by well-known businesses.

Can you mix oils of different grades?

You can mix oils of different grades, but it is not recommended. The reason for this is that the properties of each oil can be quite different, and mixing them can cause problems.

For example, if you mix a high-quality oil with a lower quality oil, the lower quality oil can begin to break down and degrade the performance of the higher quality oil.

It is best to use oils of the same grade to ensure optimal performance.


Still unsure if SAE 30 and 10w30 are the same? Overall, they are rather comparable but not identical. Follow the manufacturer’s instructions at all times, and if that isn’t clear enough, consider the local climate.

If you are seeking SAE 30 oil, the following three brands are the best:

  • Daily protection from Valvoline
  • Pennsylvania’s Highest Performance
  • Pennzoil

The following recommendations are foolproof for 10w30:

  • Valvoline High Mileage
  • Castrol GTX
  • All Mileage in Quaker State


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