Although many people believe the "w" in a viscosity grade means "weight," it actually stands for "winter." The viscosity grades are based on the outside temperature during which a vehicle is being driven.
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W. W. Lewis
George W. Bushthe W. stand for Walker
The 'W' in 15w 40 refers to 'Winter' the cold weather conditions viscosity of the oil. 15W40 engine oil consists of the cold weather properties of 15W oil as well as the high temperature viscosity of a 40.
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Winter
W-30 typically refers to the "30-weight" viscosity rating of motor oil, with "W" indicating its winter performance grade. This type of oil is commonly used in car engines, especially in warmer climates or in high-performance vehicles that require a thicker oil to provide better protection and lubrication.
The "W" stands for weight. The "W" stands for winter. 5w30 is a multi viscosity oil. It acts like both 30 weight in warm weather, and 5 weight oil in cold weather.
W - stands for Weldable P - stands for made from Pipe B - stands for Grade B
The ISO viscosity grade of Shell Tellus 37 is 32 and its SAE viscosity grade is 10W. These viscosity grades indicate the fluid's viscosity characteristics at different temperatures and operating conditions.
The Society of Automotive Engineers (SAE) has established a numerical code system for grading motor oils according to their viscositycharacteristics. SAE viscosity gradings include the following, from low to high viscosity: 0, 5, 10, 15, 20, 25, 30, 40, 50 or 60. The numbers 0, 5, 10, 15 and 25 are suffixed with the letter W, designating they are "winter" or cold-start viscosity, at lower temperature.
If the manufacture recommends the use of an Xw40 viscosity grade it should be fine. The same if an Xw30 viscosity grade is recommended but the engine is well worn. Consider also the quality certifications as well as the viscosity grade before choosing to use the oil in this application.
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Bitumen grade is a classification system based on the viscosity of the bitumen. A higher bitumen grade indicates a lower viscosity, meaning it is more viscous and suitable for higher temperature environments or heavy-duty applications.
No.First the viscosity is wrong. SAE 30 is a single-grade motor oil. The 30 is a designation of the oil's viscosity grade according to the SAE. The 25W-50 is a multi-grade motor oil, meaning 25 grade viscosity in Winter (hence the "W") and 50 grade viscosity in normal operating conditions. If you wanted to match a multi-grade motor oil in viscosity to a SAE-30 grade oil, then you would need a multi-grade oil that had ended in 30, for example 10W-30.Second, if you have been using a single-grade motor oil, you should not switch to a multi-grade because most single-grade motor oils do not have the detergent additives found in multi-grades. Switching to a multi-grade with a detergent present could suddenly dislodge gunk deposits creating a problem with solids and significantly decreased lubricant performance.Now, with all that being said, if you drive a really old diesel truck and change your oil constantly, then the 25W-50 would probably be a great choice. Since the extreme pressure and heat in old vehicles tends to thins the oil, the high viscosity is probably helpful. And, if you change the oil often, the detergent will do you more good then bad.
SAE viscosity grade
The viscosity preferred by many people is 10 W, but you can also use 5 W or 15 W, according to how stiff you want the front shocks to be.