Newer vehicles can utilize thinner oils for faster lubrication of new engine parts. In contrast, older, high-mileage engines benefit from thicker oils to prevent friction and oil loss.
A 20 W 40 oil can replace a 10 W 40 if your winter /cold temperatures are not too low. A 10W 40 will affordbetter lubrication and performance over a wider temperaturerange than a 20W 40 oil. So for 10W40 oil, when yourengine is cool it will have a 10 grade viscosity.
Best Engine Oil for Bikes Reviews
| ENGINE OIL | BUY NOW | PRICE RANGE |
|---|
| Motul 7100 4T 20W | AMAZON | Under 1,000 |
| Shell Advance ultra | AMAZON | Under 1,000 |
| Shell Rotella T6 5W-40 | AMAZON | Under 12,000 |
| Motul 3100 4T Gold | AMAZON | Under 500 |
Our pick for the best motor oil is Mobil 1 High Mileage 10W-30 Motor Oil. It's one of the best synthetic oils for high-mileage vehicles, reduces leaks, and minimizes sludge buildup. For a less expensive option, consider the Valvoline High Mileage Synthetic Blend Motor Oil.
The synthetic 10W-40 flows easily and still maintains enough viscosity to protect piston skirts and bearings when it gets hot. The improved temperature stability of synthetics makes them a better choice for race engines and serious high-performance engines.
20-50 oil is an extremely viscous oil. This oil is suitable for hot climates and will provide more protection in hot weather than 10-30 oil will. 20-50 oil is also a good choice for some older vehicles. Since 20-50 oil is very thick, it may help prevent engine leaks in old cars.
Using the 20w50 in the summer is the best in the summer and the 10w40 is best in the winter. But it really doesn't make much of a difference.
A SAE 20W-50 motor oil is typically used in older vehicles or in particularly warm climates. Castrol GTX 20W-50 has been specially formulated to help extend the life of your engine by keeping it free from sludge, even when operating in extremely high temperatures.
10 Best 20W-50 Motor Oils - Updated January 2021
| Rank | Product Name | Check Price |
|---|
| 1 | AmazonBasics Conventional Motor Oil, 20W-50, 5 Quart AmazonBasics | View Product |
| 2 | Castrol 03095C GTX 20W-50 Motor Oil, 5 Quart, 3 Pack Castrol | View Product |
| 3 | Valvoline 20W-50 VR1 Racing Motor Oil - 1qt (Count of 6) (822347-6PK) Valvoline | View Product |
Applications of 10W-40 Motor OilDrivers commonly use 10W-40 motor oil in vehicles with higher mileage because the oil is thicker while the engine is hot; this helps lubricate older moving parts. This oil is meant to start up vehicles in winter climates that experience temperatures of 10 degrees Celsius.
10w30 is a multi-grade engine oil ideal for heavy-load engines because of its ability to withstand hot temperatures for a long time without compromising the performance of the engine. This engine oil has a viscosity grade of 10 in low temperatures and 30 in high temperatures.
The brand of motor oil matters little, but its viscosity grade (10W-30, for example) is important. Use only what the owner's manual specifies. Using the wrong oil can lead to reduced lubrication and shorter engine life. If the manual says to use synthetic oil, do so.
As per Z32 fsm,10W40-20W50 is recommended if the car is driven fast,raced,or in driven in hot climates,and 10W30 is recommended for fuel economy only.
For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil. The higher number, following the “w” refers to hot weather viscosity, or how fluid your oil is at hot temperatures. The higher the number, the thicker the oil at a specified temperature.
Mobil 1™ 10W-30 is recommended by ExxonMobil for all types of modern gasoline-powered vehicles, including high-performance turbocharged, supercharged, multi-valve fuel injected engines found in passenger cars, SUVs, light vans and light trucks.
20w50 is actually thicker than 5w30. This will result in less fuel efficiency, less horsepower, and more engine damage because it will have to work harder to rotate.
In most cases, if they recommend SAE 5W-40, then SAE 5W-30 may cause problems with wear or even engine damage. SAE 5W-40 will always be “Thin” enough at any temperature, but SAE 5W-30 may be too “Thin” at high temperatures.
The 10w-40 motor oil clings to the engine's moving parts more than a 5w-30 motor oil does at higher temperatures; this means the 10w-40 is the thicker of the motor oils when the engine is running.
Yes. There is no danger mixing synthetic and conventional motor oil. However, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits.
In practice, this means that each oil is just as viscous at lower temperatures and will remain viscous at -30°C, however 5w40 oil outperforms 5w30 oils at higher temperatures, being effective up to temperatures of 50°C, as opposed to 30°C.
The main difference between the two oil types is that one is thinner than the other. The 5W40 is thinner than the 10W40 at lower temperatures. On the other hand, the 10W40 motor oils are thicker than the 5W40 oils for good reasons. This oil type works pretty well in lubricating engine parts during startup.
With an oil like a 10W40 (the W stands for winter), the oil flows similar to a 10-weight in freezing temperatures to minus 30 C and protects like a 40-weight at 100 C. With this innovation in oil performance, changing weights for the season is no longer necessary and may be detrimental.
The good news is that mixing different types of oil it will not harm your engine in any way in the short run. Most synthetic and semi-synthetic engine oils are based on regular oil and are compatible. Now, as far as different grades are concerned, mixing between them isn't something that will damage your engine either.
ViscosityThe working viscosity of 5w30 is basically from 9.3 to 12.5mm2/s whereas the operating viscosity of 5w40 is 12.5 to 16.3mm2/s. That means 5w40 has larger viscosity than 5w30. So, 5w30 is better than 5w40.
The results show that among the vegetable oils studied, rice bran oil (0.0398 Pa·s at 38°C) was the most viscous followed closely by the macadamia nut oil (0.0394 Pa·s at 38°C) while the walnut oil (0.0296 Pa·s at 38°C) was the least viscous and followed closely by the safflower oil (0.0299 Pa·s at 38°C).
Automotive Lubricant Viscosity Grades: Engine Oils – SAE J 300, Dec. 1999
| SAE Viscosity Grade[°C] | Min. Viscosity [mm²/s] at 100 °C | High Shear Rate Viscosity [mPa.s] at 150 °C |
|---|
| 30 | 9.3 | 2.9 |
| 40 | 12.5 | 2.9 * |
| 40 | 12.5 | 3.7 ** |
| 50 | 16.3 | 3.7 |
In layman's terms, viscosity defines a fluid's resistance to flow. The higher the viscosity of a liquid, the thicker it is and the greater the resistance to flow.
The lower the number, the less the oil thickens in cold weather. The numbers after the “XW” indicate viscosity at 100 degrees Celsius and represent the oil's resistance to thinning at high temperatures. For instance, oil with a 5W-30 grade thickens less than oil with a 10W-30 grade in cold weather.
SAE 30 is typically called for in lawn mower or similar engines. 40 weight oil is going to be just a little thicker (technically speaking more viscous). SAE 30/40/50 mono grade oils are of the past and no longer being used now with the advent of multigrade oils and of late synthetic oils.
Viscosity is determined by the fluid's resistance to flow. The viscosity grade of an engine oil provides information on the oil's resistance to flow in your vehicle's engine. An engine oil with a low viscosity grade will be more fluid and will flow easily.
SAE 10W-40
| Temp. [°C] | Dyn. Viscosity [mPa.s] | Density [g/cm³] |
|---|
| 0 | 735.42 | 0.8758 |
| 10 | 385.53 | 0.8692 |
| 20 | 208.89 | 0.8629 |
| 30 | 121.63 | 0.8567 |
Detergent additives, dating back to the early 1930s, are used to clean and neutralize oil impurities which would normally cause deposits (oil sludge) on vital engine parts. Typical detergents are magnesium sulfonates. Corrosion or rust inhibiting additives retard the oxidation of metals inside an engine.
Product Description. Mobil Gas Engine Oil 15W-40 is a premium fleet engine oil specifically formulated to provide reliable protection for trucks and buses using Compressed Natural Gas (CNG) or Liquefied Natural Gas (LNG).
