What are viscosity index improvers?

Jan 17, 2017 ... Viscosity (a fluid's resistance to flow) is rated at 0° F (represented by the number preceding the "W" [for Winter]) and at 212° F ... Apr 3, 2013 ... The sole purpose of this group is to test the lubricants resistance to flow, also known as viscosity. Lubricant quality and specifications are ... May 6, 2003 ... The higher the number, the thicker the oil. Where you have two numbers, one followed by a W it means the oil has additives in it that make it ... 5 days ago ... When you spray it on, it run down, but this is nice because it doesn't, like, run everywhere, and you can just rub it in. kind of like lotion. Mar 13, 2020 ... How does adding a synthetic blend alter this equation and is it good for my engine? What do numbers like 10W-30 or 25W-40 mean on the oil ... Feb 15, 2022 ... ... should know about your vehicle's oil system. Read below to take a deep dive into what those oil lights on the dash mean. If you want to ... Jan 17, 2023 ... AMSOIL synthetic lubricants boast high VI numbers, meaning they're more stable than competing lubricants under extreme temperatures and ... The viscosity grade (for example, 5W-30) tells you the oil's thickness, or viscosity. A thin oil has a lower number and flows more easily. Feb 25, 2020 ... The number before the W represents the viscosity (thickness)and rates the oil's flow at -17.8 degrees Celsius. So, a 5W-30 would thicken less than a 10W-30 but ... Jul 9, 2018 ... These multi-grade oils have steadily evolved since then to meet the needs of today's more advanced engines. What the numbers mean. The numbers ...