What are oil additives?

How Often Should You Change Your Oil? ... With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall. May 30, 2023 ... Engine oil numbers refer to the viscosity of the oil. Learn from the Repco team why these numbers are important to select the right oil for ... 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 ... The numbers on an oil seal usually indicate its dimensions, specifically the inner diameter (ID), outer diameter (OD), and width. For example, a seal marked “38 ... I mean, I knew it meant to be carefull for the direction you install the oil filter cartridge... but I had no idea what PA or AL meant? I had asked a few car ( ... Now that we understand what the first number represents, it's time to focus on the second one, which is 40 in our example. It shows how thick the oil is under ... Oil viscosity explained: It's the measure of oil's resistance to flow, affecting lubrication, reducing friction, and ensuring optimal engine performance. Nov 26, 2021 ... What do Acid Number (AN / TAN) and Base Number (BN / TBN) mean on a lube oil sample analysis report? The viscosity of an oil is measured by its resistance to flow. There are two numbers that define viscosity meaning. The first number precedes the letter 'W' ... Feb 6, 2025 ... The grade of oil will usually be “number + W + number” for example “5W-30.” The “W” means “winter.” The number before the “W” represents the cold winter ...