![]() Oil specifications - ACEA vs APIĪpart from the viscosity index, there are other factors to consider when choosing an engine oil for your vehicle. For example, a 75W90 transmission oil doesn't have a higher viscosity than a 15W40. If you are interested, you can see more information regarding SAE specifications here.īut be careful: transmission oils have a different SAE numbers. Here you can see the recommended oil for each ambient temperature: You should be aware of climate changes in order to keep your engine fully functional. The number before the W represents the oil viscosity at lower temperatures, while the second number (after the W) indicates the viscosity at operating temperatures.įor example, this means that 5W30 engine oil has less viscosity at lower and higher temperatures when compared to 10W40. The SAE (Society of Automotive Engineers) established a numerical code to represent the viscosity of oil at both hot and cold temperatures. Some synthetic oils are able to achieve this variation without additives. To be able to change the viscosity index, conventional oils incorporate additives, usually plastic polymers. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. The viscosity changes with temperature to ensure protection and operability under all circumstances. A higher viscosity implies a slower flow and a thicker fluid. ![]() Viscosity is simply the resistance of a fluid to flow. Find out more about the latest technologies being used to detect hydrogen contaminants in ‘Combination of OFCEAS Spectroscopy and Low Pressure sampling, for Impurities Measurement in Hydrogen Production and Storage.After a brief review of the use of engine oil, we will now move on to one of the most important concepts: oil viscosity index. The hydrogen market is also concerned with impurities that can contaminate gas and damage fuel cells. Even minor changes can impact performance and increase the risk of unplanned downtime and in a worst case scenario, critical failure.Ĭontaminants such as H20 and particulate matter don’t just compromise the efficacy of lubricants. Monitoring viscosity is one of the most importance elements of any lubricant analysis strategy. However, a variety of factors can affect viscosity and compromise a lubricant’s ability to achieve goals like reducing friction and preventing wear. Viscosity is generally calculated using a clean and high quality sample, in stable operating conditions at a temperature of 40☌. ASTM D2270 is one of the most widely used methods used to calculate viscosity index. At 100☌ both benchmark oils should have the same viscosity as the lubricant being tested. A number is assigned by comparing the kinematic viscosity of the lubricant at 40☌ with the kinematic viscosity of two benchmark oils, one with a VI of 100 and the other with a VI of 0. Viscosity index (VI) is used to measure how dependent on temperature the kinematic viscosity of a lubricant is. Dynamic viscosity measures the force needed for the lubricant to achieve a certain flow rate. Kinematic viscosity describes the rate at which a lubricant is flowing when exposed to a certain level of force. When describing viscosity, two parameters are used. They’re generally used for smaller, faster moving components. In comparison, low viscosity lubricants are thin and fast-flowing. High viscosity lubricants are thicker and more resistant to flow, making them suitable for heavy-duty applications. As a result, viscosity is one of the most important physical properties of lubricants considered when developing mechanical maintenance strategies. Viscosity plays an important role in determining the thickness of the protective film created by the lubricant, as well as factors like load capacity and ability to reduce friction. What is viscosity?Īlso known as internal friction, viscosity describes how resistant a lubricant is to flow. Internal resistance to flow determines how a lubricant will behave when in use, if it can achieve specific goals and ultimately, if it’s suitable for the application.īelow, we take a closer look at the importance of viscosity and why it’s one of the top physical properties of lubricants considered by operators. Viscosity is one of the most important physical properties of lubricants to consider when choosing a product. From ultra-light oils to heavy-duty greases, lubricants come in an array of forms.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |