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The minimum viscosity of the 10W oil at 100C (212F) is 4.1 cSt.

Now lets look at the high temperature test requirements, we will look at the 10W-30 again. This means that when your engine is cold the lower the W number the easier the oil will flow.

As you can see from the table, the lower the W number the lower the Cranking (cP) at lower temperatures. Referring to the J300 table, to list a multi-viscosity oil as a 10W the Cranking (cP) max at temperature of -25C (-13F) can not be higher than 7000 and the Pumping (cP) max with no yield stress at tempera ture of -30C (-22F) can not be higher than 60,000. The W or winter number is important for low tem perature performance. To label multi-viscosity oil 10W-30 or any of the other multi-viscosity grades, the oil must conform to stringent test parameters performed at low temperatures and high temperatures. The W stands for winter not weight and there is a standard called the SAE Viscosity Grades for Engine Oils – SAE J300. Oils with 10W-30 and other similar designations are referred to as multi-viscosity oils. Oil viscosity is inversely propor tional to temperature, as the temperature of the oil goes up the viscosity goes down. How could you have oil that’s viscosity worked exactly opposite of the physics of the liquid. Many people think 10W-30 means that when the oil is cold it has the viscosity of a 10 weight oil and when the oil is hot is has the viscosity of a 30 weight oil. Have you every wondered what does 10W-30 or 20W- 50 mean?