AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Hths viscosity meaning1/23/2024 Table 1 outlines some API “C” series service categories and the general performance requirements that the oil must meet. A description of the API service symbol and category mark can be found in the Engine Oil Guide published by the API. The API “S” series describes oil standards primarily for gasoline engines while the API “C” series describes oil standards for diesel engine service. ![]() Each letter/number designation identifies a service category (e.g., CI-4) which is linked to a series of tests that the oil must pass before it is allowed to carry that designation. The API Engine Oil Licensing and Certification System provides a simple designation of letters and numbers that allows engine manufacturers and oil marketers to clearly provide users with the information they need to ensure that the proper oil is selected for an engine. Global Performance Specification for Diesel Engine OilĪPI Classifications API Oil Service Categories.Oil classification systems have been also in place in the EU and Japan. In the USA, the API oil classification system provides a simple designation for engine oils to ensure that the proper type of oil is selected for an engine. Fuel consumption should be lower as a result of the reduced HTHS index.Abstract: A number of oil specifications have been developed to ensure that lubricants provide all of the lubricating oil functions required in modern engines. Engine oil qualities in category ACEA A1/B1 have a reduced HTHS of up to 2.9 mPas. The limit value for engine oils with specification ACEA A2/A3 and ACEA B2/B3 is to be found at an HTHS of 3.5 mPas. HTHS limit values are defined to ensure that even in bearings (where both shear forces and oil temperatures are high), engine oils can be relied upon to provide the necessary lubrication. It is expressed in millipascal seconds (mPas). It describes dynamic viscosity measured at 150☌ and under higher shear forces. HTHS stands for High Temperature High Shear. The viscosity classes referred to above (winter and summer) are supplemented by what is known as HTHS viscosity. The larger the number in front of the W, the higher the viscosity of the oil at 100☌. Typical viscosity classes are 20, 30, 40, 50 and 60. SAE summer viscosity classes are classified at a test temperature of 100☌. Kinematic viscosity describes the ratio between dynamic viscosity and the thickness of the engine oil at a certain temperature. The lower the cold viscosity index, the easier the cold engine will turn over on starting. Dynamic viscosity affects the starter speed when the engine is cold, for example. The smaller the number in front of the W, the lower the viscosity of the oil at cold temperatures. ![]() ![]() Oils are divided into the winter viscosity classes 0W, 5W, 10W, 15W, 20W, 25W. This describes the engine oil's resistance to flow at low temperatures. Measures of viscosity are based on two variables: SAE 5W30 is an example of a viscosity designation of a multi-grade oil. Most of the oils used today are multi-grade oils. As long ago as 1911, viscosity provided the basis for the first engine oil classification system and was defined in the Society of Automotive Engineers (SAE) classification system. It is determined by the internal friction which resists the flow of adjacent particles in the fluid. Viscosity is measure of a fluid's resistance to flow. The viscosity of an oil is always marked on its barrel. Viscosity is one of the most important properties of engine oil.
0 Comments
Read More
Leave a Reply. |