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.
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 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.
centistokes (cSt)
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.
Sure but by doing that you change the viscosity slightly.
SAE (Society of Automotive Engineering) 20W is a quality (viscosity) of oil. SAE J300 has established eleven viscosity grades, of which six are considered Winter-grades and given a W designation. The 11 viscosity grades are 0W, 5W, 10W, 15W, 20W, 25W, 20, 30, 40, 50, and 60. These numbers are often referred to as the 'weight' of a motor oil. The lower the viscosity grade, the lower the temperature the oil can pass the standard test. For example, if an oil passes at the specifications for 10W and 5W, but fails for 0W, then that oil must be labeled as an SAE 5W. That oil cannot be labeled as either 0W or 10W.
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