![]() Note: Compounded oils must have 3-10% suitable animal fats. The American Gear Manufacturers Association (AGMA) and the International Standards Organization (ISO) have established viscosity standards for hydraulic fluids and industrial gear lubricants.įollowing are the AGMA Lubricant Numbers, the corresponding ISO Grade and the viscosity ranges: Axle and Manual Transmission Lubricant Viscosity ClassificationĪGMA 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 – 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. If you live in a state where extreme temperature swings occur, you might want to consider 10w-40 because it helps preserve engine condition.The Society of Automotive Engineers (SAE) viscosity grading system for engine oils consists of “W” grades that define low temperature viscosities and “straight” grades that put further limits on high temperature viscosities.It’s thin enough to flow well in most conditions but thick enough to protect your engine at high temperatures. The “30” in a 10W-30 oil, for example, refers to its viscosity: it has a thickness of 10 when cold and 30 when hot. To read the grade of engine oil, look at the SAE (Society of Automotive Engineers) classification.A lighter-weight oil will flow better when it’s cold outside. If you live in an area where it’s cold outside (sub-may be), go for a 0W (meaning zero degrees). ![]() The lower the number, the thinner the oil. ![]() Motor oil is rated by viscosity or thickness.People who live in the South might want a lightweight oil that flows better when it’s cold outside but is still capable of keeping the engine lubricated, protected, and smothered in Vaseline when it’s 100 degrees. Synthetic oil is made in factories using spherification.Ī blend of synthetic and conventional oils is used to balance moderate climates. Conventional oil is made in factories with chemicals added to control viscosity. What is The Difference Between Synthetic And Conventional Oils?īoth types do the same thing – protect your engine. In the summer, it’s the opposite, so that more of what little water there is from condensation doesn’t evaporate into the air. In the winter, you want a more slippery oil so that parts don’t stick together as much. The different numbers of motor oil have to do with cold and hot weather. Engine oil grades help to improve gas mileage and reduce emissions. For example, if your car takes SAE 30 or SAE 10W-30 motor oil, be sure to buy SAE 30. The higher the number, the better quality motor oil is. When buying oil, look at the API (American Petroleum Institute) star rating. Engine oil improves gas mileage, reduces the risk of engine damage, and lowers emissions. It is also what cools the motor and keeps it clean. Engine oil is used to make sure all parts work together. What is Engine Oil Used For?Įngine oil protects the motor from wear and tear by keeping metal parts from touching each other. In this blog post by The Key Online – Tulsa, you will learn how to read engine oil and what each grade means so that you understand which one is right for your car. It’s important to remember that engine oils are expensive, and you should not buy a cheaper oil just because it has the same grade as a more expensive one. FebruOil Explained! How To Read The Grade Of Motor Oil?Įngine oils grades can be confusing, and it can take time to fully understand what each oil is for and how they work.
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