#Sae oil viscosity chart manual
#Sae oil viscosity chart iso

The numbers to the right of the letter вЂњWвЂќ are its hot grade.The higher the grade, the more viscous the oil will be at high temperatures. The lower the viscosity when cold, the more fluid the oil is at low temperatures and the more easily it can be pumped.Greater levels of fluidity at low temperatures make cold starts easier. The viscosity designation is made up of two numbers separated by the letter вЂњWвЂќ (for вЂњWinterвЂќ for the cold grade).The numbers that come before the W refer to the productвЂ™s cold grade, i.e., its viscosity at low temperatures. The SAE (Society of Automotive Engineers) has developed a means of classifying lubricants in order to specify their viscosity levels when hot and when cold. Oils can be separated into multigrade oils and monograde oils. It should remain fluid at low temperatures (to make cold starts easier) and viscous at high temperatures (in order to provide protection and sealing).The grades that have been optimized for each of your oils are detailed in your service manual. The viscosity grade of a lube oil is determined by the Society of Automotive Engineers (SAE).

To ensure that your vehicle performs optimally, your oil should retain a certain level of viscosity in all weather conditions: Viscosity varies according to temperature in the following way: the higher the temperature, the more fluid and less viscous the oil will be. An oil can, in effect, be characterized by its viscosity, its flow resistance or by the thickness of its oil film. Lubricants behave differently at high and low temperatures. Non-EP lubricant grades are rust and oxidation inhibited, only EP Lubricants are mild Extreme Pressure type.Engine Oil Viscosity/ Motor Oil Viscosity Note: Compounded oils must have 3-10% suitable animal fats.

#Sae oil viscosity chart iso

The American Gear Manufacturers Association (AGMA) and the International Standards Organization (ISO) have established viscosity standards for hydraulic fluids and industrial gear lubricants.ДЇollowing are the AGMA Lubricant Numbers, the corresponding ISO Grade and the viscosity ranges:

#Sae oil viscosity chart manual

Axle and Manual Transmission Lubricant Viscosity ClassificationДЄGMA and ISO Viscosity Grade Classifications.

Following is a table with the SAE gear lubricant viscosity grades: For instance, an SAE 80W gear lubricant may have the same viscosity as an SAE 20W or SAE 30 engine oil and SAE 90 gear lubricant viscosity can be similar to that of an SAE 40 or SAE 50 engine oil. A gear lubricant and an engine oil having the same viscosity will have widely different SAE viscosity grade designations as defined in the two viscosity classifications.

Gear lubricant viscosity grades should not be confused with engine oil viscosity grades. The Society of Automotive Engineers (SAE) has devised a method for classifying the viscosity characteristics of gear lubricants as well. Following is the API description: SAE Viscosity Grades for Gear Lubricants The automotive and petroleum industries in cooperation with the American Society of Testing and Materials (ASTM), Society of Automotive Engineers (SAE) and the American Petroleum Institute (API) have developed a service classification system to serve as a guide for recommending and marketing gear lubricants. Viscosity Temperature Chart API Service Designation for Gear Lubricants SAE Viscosity Grades for Engine Oils вЂ“ SAE J300 Dec 99 The chart shown at the bottom of the page graphically represents the viscosity-temperature relationship of the SAE grading system with lines drawn to show the viscosity characteristics for several popular motor oils. The Society of Automotive Engineers (SAE) viscosity grading system for engine oils consists of вЂњWвЂќ grades that define low temperature viscosities and вЂњstraightвЂќ grades that put further limits on high temperature viscosities.