What does the W stand for in 10W30 oil?

Question

What does the W stand for in 10W30 oil?

Answer 1

winter

the first number is winter rating lower is better because it will flow better in cold

the second number is operating temperature rating higher the thicker it stays and the less it thins out.

For an example if you heat up syrup it gets thinner but its thicker when cold.

If it doesnt have a winter rating then it can be a stright 30 stright 40 etc.

The winter rating shows its sutible for use in the winter.

Answer 2

Multi-weight oils (such as 10W-30) are a new invention made possible by adding polymers to oil. The polymers allow the oil to have different weights at different temperatures. The first number indicates the viscosity of the oil at a cold temperature, while the second number indicates the viscosity at operating temperature.

Answer 3

WEIGHT

Answer 4

some people think that it stands for winter because that first number is the cold weight. i can not give you an answer other wise though i do not have my sources available.  

Answer 5

weight....

Answer 6

The SAE designation for multi-grade oils includes two grade numbers; for example, 10W-30 designates a common multi-grade oil. Historically, the first number associated with the W (again 'W' is for Winter, not Weight) is not rated at any single temperature. The "10W" means that this oil can be pumped by your engine as well as a single-grade SAE 10 oil can be pumped. "5W" can be pumped at a lower temperature than "10W" and "0W" can be pumped at a lower temperature than "5W". The second number, 30, means that the viscosity of this multi-grade oil at 100°C (212°F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature. The governing SAE standard is called SAE J300. This "classic" method of defining the "W" rating has since been replaced with a more technical test where a "cold crank simulator" is used at increasingly lowered temps. A 0W oil is tested at -35°C, a 5W at -30°C and a 10W is tested at -25°C. The real-world ability of an oil to crank in the cold is diminished soon after put into service. The motor oil grade and viscosity to be used in a given vehicle is specified by the manufacturer of the vehicle (although some modern European cars now make no viscosity requirement), but can vary from country to country when climatic or mpg constraints come into play. Oil circulates through the piston oil rings to cool and lubricate the compression rings. Inside gasoline engines, the top compression ring is exposed to temperatures as high as 320 °F (160 °C).

Many new vehicles are marked to use 5W-20 oil (Honda, Ford, and more recently Toyota) which is not much thinner than a 30W oil. Nay-sayers of 20W oil's ability to protect engines should note that typically, 30W oils shear down into the 20W range anyway. Most engine wear is during start-up and warm-up period, where the thinner 20W oil's flow is desirable. Overall, lab test results of the wear metals contained in used oil samples show low or lower wear with 20W than 30 in applications it is specified for. Some ultra fuel efficient and hybrid vehicles are marked to use 0W-20 oil. For some selective mechanical problems with engines, using a more viscous oil can ameliorate the symptoms, i.e. changing from 5W-20 to 20W-50 may eliminate a knocking noise from the engine but doesn't solve the problem, just "masks" it. Excess amounts of oil consumed by an engine burning it can be addressed by using a thicker oil, a 10W-40 might not burn off as fast compared to a 5W-30. A newer product that also addresses this issue is the "High-Miles" oils now marketed. They tend to be slightly thick for their grades, contain extra additives and seal conditioners. Apparently the formulation of these oils works well in many instances.

Answer 7

weight  

Answer 8

weight.

also you should be ashamed of yourself for telling the 14 year old girl to kill herself.  whats wrong with you???????????   I really hope you get booted from here.  

Answer 9

WEIGHT

Answer 10

that W you see stands for winter. look in a haynes book, it will tell you.