Oil : Understanding oil grade Coeds

Posted by Wael A. Saad On Saturday, 23 June 2012 3 comments

Understanding oil grade Coeds

The SAE designation for multi-grade oils includes two grade numbers; for example, 10W-30 designates common multi-grade oil. Historically, the first number associated with the (W) 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 notice that ('W' is for Winter, not Weight) .

oil grade codes
Oil Grade
"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 (−31 °F), a 5W at −30 °C (−22 °F) and a 10W is tested at −25 °C (−13 °F).

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.

These classifications, the winter grades of 5W, 10W and 20W are determined by the oils' viscosity at less than 0° Fahrenheit (-18°C), while grades 20, 30, 40 and 50 are determined by its viscosity at 212° Fahrenheit (100°C). Those are the predetermined temperatures.

The next table will explain how to use OIL GRADS.
Oil type
Typically used in....
Cooler climates, like Sweden or Canada
Temperate climates, like England
Hot climates, like Italy, Spain, Egypt

Based on the range of viscosity the oil falls in at that temperature, the oil is graded as an SAE number 0, 5, 10, 20, 30, 40, 50, or 60. The higher the viscosity, the higher the SAE grade number is.
For single-grade oils, the kinematic viscosity is measured at a reference temperature of 100°C.The reference temperature is meant to approximate the operating temperature to which motor oil is exposed in an engine.

definitions : 

Mono grade : definition of oil specification where the kinematic viscosity is measured at a reference temperature of 100°C.

Multi-grade : definition of oil specification to measure the kinematic viscosity where The temperature range that the oil is exposed to in most vehicles can be wide, ranging from cold ambient temperatures in the winter before the vehicle is started up to hot operating temperatures when the vehicle is fully warmed up in hot summer weather.

Read Also;
How to change Engine oil? DIY
Oil types and grades
Understand oil grades codes
Why & when we change the engine oil?

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