Using 10w40 oil in the summer will help the oil stick to internal components in high temperatures, avoiding the wear and tear from metal-to-metal contact between moving parts. As previously mentioned, the only difference between 10w30 and 10w40 oil is their thickness at engine operating hot temperatures. In the past, it was common practice to switch to a higher viscosity oil as an engine got older, for example, using a 20w50 oil in place of the 10w40 recommended by the manufacturer.
As oil passages wore down from friction and expand, switching to a thicker oil helped the oil pump push oil through them, ensuring complete lubrication. However, in modern engines, this is not a good idea. Improvements in machining, oil chemistry and oil filtration means these oil passages remain the same size throughout the life of the engine. Most burning of oil comes not from increased gaps between components, but from aging seals.
This means at different low temperatures; they have the same viscosity. Your choice of motor oil between 10w30 and 10w40 will depend on the conditions you are driving in and the type of car you are driving. If you are driving in high temperatures, specifically temperatures greater than 90 degrees Fahrenheit, you should use 10w The thickness of 10w40 is better equipped to deal with the increased load and prevents metal-to-metal contact inside the engine better than 10w30 oil.
Its operating range is up to 85 degrees Fahrenheit. It can handle cold starting temperatures well and reduce wear and tear on most casual driving vehicles. Cold weather is typically considered to be anything below 0 degrees Celsius or 32 degrees Fahrenheit.
Smaller numbers are less viscous or thinner than more significant numbers. The smaller the first number, the better it performs at lower temperatures. For multi-grade oil, the first number can be any value from 0, 5, 10, 15, and There are single-grade oils that only have a single number, such as 20w or These oils are only made for a single temperature.
The second number in multi-grade oils such as 10w30 and 10w40 represents the viscosity of the oil at summer temperatures. Summer temperatures or hotter temperatures typically refer to temperatures greater than 0 degrees Celsius or 32 degrees Fahrenheit. It is typically regarded as the viscosity of the oil when the engine is running. The larger the second the number, the more viscous it is at higher temperatures.
As a result, 10w40 provides better protection against metal to metal contact and greater fuel efficiency than 10w30 at higher temperatures.
The difference between motor oil such as 10w and 10w40 is all about viscosity. When a liquid is less viscous, it flows faster and thus has less resistance to flow. Likewise, when a liquid is more viscous, it flows slower and thus has more resistance to flow. For example, water is more viscous than honey because it flows faster.
If you were to pour 1 cup of water and 1 cup of honey into a container, the water would fill the container much faster. The same applies to motor oil. In this case, 10w30 is more viscous than 10w40 at higher temperatures. Oil is graded on the SAE J standardized scale. This sale classified oil based on its viscosity at different temperatures.
This is typically the viscosity when you are starting your vehicle. Winter temperatures include any temperature below 0 degrees Celsius or 32 degrees Fahrenheit. This is the viscosity when the engine is running. As the temperatures continue to rise, it might not lubricate the internal components as well. To be safe, spend a little more and use 10W40 for better protection at high temperatures.
If you search online about mixing oils, you will get a lot of people telling you it is okay. However, it is advised against because of multiple reasons. First, mixing motor oil grades can create an oil pressure decrease as the engine revs higher. This problem could cause a bearing to go bad due to spinning. While both function the same in cold temperatures, the one is designed to be thicker in warmer climates.
By carrying motor oil with you, this situation can be avoided. Ask any car question in our new community! Magnus is the owner and main author of MechanicBase. He has been working as a mechanic for over 10 years, and the majority of them specialized in advanced diagnostics and troubleshooting. Certified Automotive Diagnostic Technician. I do have Toyota Vitz 1KrFe cc engine. Recently done head assembly replacement work because of oil consumption issue. All I want to know that because of not having actual mileage of engine recently purchase which oil grade shall I use currently using 5w30 liqui moly Tec AA series also I live in a region where temperature get rise to 45degree in summer and range 5 to 7 degree in winter.
Kindly do guide can I use same oil grade in summer or go for little thick grade like 10w Last, I Am not daily driver like it take around 3 to 4 month to drive about to km. Contents show. Understanding Oil Viscosity. Understanding Oil Grade. When to use 10W30 Oil. When to Use 10W40 Oil.
Mixing 10W30 and 10W40 Motor Oils. Still have questions? Leave a reply.
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