Is It OK To Use 10W40 Instead of 10W30? here’s why


When it comes to car care, there are a lot of choices to make. From choosing the right oil to refilling your tank, you may be wondering which oil is best for your car. But what about DOT 4 or DOT 5? Do they both have the same benefits? And are 10W40 and 10W30 the same oil?

10W-40 motor oil has a higher viscosity, retaining more thickness than 10W30 as the temperature rises. In that case, it would technically provide better protection against engine wear a contact in high temperatures since 40ºF or so is at what’s considered summertime for most of North America (though some areas may experience warmer weather earlier).

What is 10W40?

DOT 4 is a type of hydraulic fluid used in hydraulic pressure systems and hydraulic rams. It has a viscosity of 9.7 cps (centipoise) at 25°C. This means that it’s thicker than water, making it ideal for use in high-pressure systems like car engines.

The “4” in DOT 4 refers to the fourth revision of the specifications for this type of oil, released on June 24th, 2010. The “4” in DOT 4 stands for “fourth revision.”

DOT 5 is also a type of hydraulic fluid used in hydraulic pressure systems and hydraulic rams. It has a viscosity of 8 cps at 25°C, making it thinner than water, making it less ideal for high-pressure systems like car engines.

The “5” in DOT 5 stands for the fifth revision of the specifications released on September 1st, 2009.

What are the benefits of using 10W40?

The most important benefit of using 10W40 is its viscosity—the thicker the oil, the better protection it provides. Additionally, 10W40 has lower volatility and a higher pour index.

Viscosity relates to the thickness of an oil’s surface and how fast it flows. The lower the viscosity, typically, the faster an oil will flow. But sometimes, these oils are too thin to provide adequate protection.

A pour index measures how easy oil is to pour out of a container onto its surface. An oil with a higher index also means that it will more easily flow into moving parts during vehicle maintenance, such as changing your oil or adding transmission fluid.

Also Read: 10W40 vs. 5W30: What Happens If I Use the Wrong Motor Oil?

Is it OK to use 10W40 instead of 10W30?

The short answer is yes. Because both oils are formulated to give the same performance, it will be safe for you to use either oil. Some differences between the two oils include viscosity and base oil.

Viscosity refers to how a liquid flows through a pipe. The higher the viscosity, the more viscous a fluid is and the harder it is to move through a pipe or an engine. An oil’s viscosity is also related to its thickness; thicker liquids generally have lower viscosities than thinner liquids.

The heat index number represents how well it flows at operating temperatures and in hot weather for these oils. The higher this rating is for a specific type of FZPNP or API Certified engine oil; they will be able to better protect your car’s components from being damaged by extreme pressure as well as high-temperature changes.

The only difference between 10w30 and 10W40 oils is the thickness at engine operating temperatures. They will flow equally well during cold startups since both formulations have a viscosity of “10” when reacting with air or other gases (surplus).

If you want to help your engine warm up faster, use 10w30 oil. This will reduce the excessive temperatures and drag due to cold weather as it chills out with a lot less energy than regular oils do on hot summer days when they’re overheating.

As winter comes around this year, make sure that our vehicle is running smoothly by replacing those old high-performance fluids with new ones formulated specifically for these seasons. 

You’ll notice an instant difference in terms of acceleration time so we can get back safely into our cars after being outside all day long. Whether I’ve just been walking along the street or if something has happened while driving too far away from home.

If you want to avoid metal-to-metal contact between moving parts, summer is not the time for 10w40 oil. In high temperatures, even light greases can begin melting and running out of control, so it’s best if we keep our car cool with a yearly tune-up instead.

When you’re ready for some winter driving, it’s wise to start with the right fluids.

10w30 is just fine for summer and will help keep things running all season smoothly long- unless, of course, we have snowy conditions on hand (which would be bad news).

The base oil provides lubrication and makes an oil effective for lubricating moving parts of your car engine. For example, 10W30 has petroleum distillates, while 10W40 has synthetic base oils like polyalphaolefin (PAO) and synthetic mineral oils (SMO). These two oils have similar bases but different physical properties that impact how they perform in your engine.

What happens if you use 10W40 instead of 10W30?

So, if you change your oil to 10W40 in the winter when it’s cold outside and snowing, then don’t worry because this will not affect anything on an engine. But during summertime or hot weather seasons – make sure that there are no ties with the Summer Oil Change Form available at our shop.

DOT 4 and DOT 5 are the two most common types of oil used in cars today. The difference between these oils is their viscosity—the thicker the oil, the harder it will be to flow.

10W40 has a higher viscosity than 10W30. This means that when you pour 10W40 into your engine, it will have a harder time flowing through the engine and moving around the parts.

However, if you use 10W40 instead of 10W30, the oil will stay in place better without leaking out or dispersing throughout your engine. The downside to this is that it’s much harder to change the type of oil when you’re driving.

What is the difference between 10W30 and 10W40?

10W30 is a mineral oil that has a viscosity rating of 10. The 10W40 and 10W50 are synthetic oils with a rating of 40 and 50, respectively.

The difference between these oils is the level of performance they provide.

A viscosity rating helps you understand how thick or thin oil can be depending on its base fluid. A broader number indicates a thinner oil than a narrow number, which means it’s thicker.

When it comes to engine lubrication, you want something that’s not too thick, so it doesn’t cause your engine to overheat. Thin-oil also gives better control and efficiency.

A higher viscosity rating also means more protection from wear and tear caused by high-pressure engines, such as car engines. Thinner oils are typically used for normal car use because they give better performance and last longer than thicker oils.

Also Read: Is 10w40 oil thicker than 20w50? Do They Have the Same Effect?

Can I use a 10W40 instead of a 10W30 motorcycle?

Higher temperatures can lead to engine damage, so you must protect your bike from extremely hot weather. This won’t affect performance at low or moderate ambient conditions for most motorcycles, but if stuck in a Carmelite sun situation, be aware of possible thinning oil effects on metal surfaces.

Motorcycle oil is not similar to car oil. But if your motorcycle uses 10W40 instead of 10W30, then you are good to go. You can continue using that oil for your motorcycle without a problem.

The difference between 10W-30 and 5w20 motor oils is so small; you will never notice it. Performance may improve by 1/2 second on your laps times if that’s all the luck we get.

The most important difference between the two oils is that 10W40 motorcycle oil does not have anti-wear additives or detergents in it, so it’s not suitable for use in automobile engines.

Also Read:Can I use 10W40 instead of 20w40? here’s why

Can I use 10W40 instead of 10W30 in my lawnmower?

SAE 30 motor oil is usually the go-to for engines in lawnmowers, but it’s not as safe because different types of car oils can also be used. However, 10W-30 or 10w40 could work well with your specific brand and type too.

Some four-stroke lawnmowers these days recommend a 10w30 rather than the traditional 30 weight so that you could go with either of those oils. 

The difference will be small, and you won’t notice it when hot, but if you want better engine performance, I would suggest going for an oil that has more density – like 40 or 50-grade motor Oil.

The recommended motor oil for your lawn mower is the same type used in cars, so if you have a car and want to be safe, then use SAE 30. However, it’s also possible that there are other factors at play here – some engines need certain viscosity grades while others don’t care about them at all.

5W40 – This oil contains high zinc levels, making it ideal for use in cold weather conditions.

10W40 – The extra four weights per gallon make this oil perfect for lower temperature and longer-lasting engines.

20W50 – This oil has a low-temperature viscosity level to make it easier to flow in colder weather conditions.

Jim Harmer

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