11/23/2023 0 Comments Mineral oil viscosity vs other oils![]() ![]() But as the engine heats up, the 5W-20 will move with less resistance than an 5W-30. Again, the lower the number, the lower the viscosity of the oil and the faster the oil will move around the engine.Īs an example, let’s compare 5W-20, 5W-30 and 10W-30 motor oils. A 5W-20 and 5W-30 will have very similar if not equal viscosity at lower start-up temperatures. In the 5W-30 example, the 30 defines the viscosity of the oil at normal engine temperatures. The high temperature viscosity is the number after the dash and is related to the viscosity of the oil as it is moving around your engine after the car has warmed up and is at normal engine temperature. The lower the number, the faster the oil will flow at vehicle start up. For example, if the oil is a 5W-30, the 5W part describes the viscosity of the oil at low temperatures. That value has the letter “W” after the number and has a dash after the W. The low temperature viscosity of the oil is a measurement that simulates starting a car on a cold winter day. But as motor oil technology advanced, additives such as viscosity index improvers allowed for the use of the same grade of oil year-round. Years ago, most vehicles used one viscosity grade oil in the summer and a different viscosity grade oil in the winter. The measurement of viscosity at high and low temperatures are properties of multi-grade oils. Motor oil viscosity grades are based on a scale developed by the API (American Petroleum Institute) lubricant organization. The values are defined in a specification known as API 1509 and are based on the resistance the oil gives to flowing at two different temperatures – cold and high temperature. What should you use? Check your engine's manual and follow the manufacturer's instructions - always the best bet for long engine life.Viscosity is the resistance to flow of a fluid. The Continental Motors engine break-in guide recommends straight mineral oil, while Lycoming recommends AD oil when breaking in all turbocharged engines. ![]() However, not all manufacturers recommend this practice. It's thought that mineral oil is less viscous (less slippery) than AD oil, and that it will allow the piston rings to wear in the cylinder walls more quickly. Many pilots have learned to use straight mineral oil while breaking in a new engine. ![]() What Oil Type Should Be Used For Break-In "When the engines were disassembled, we found that the piston rings were covered with a gray tacky substance that was primarily made up of the lead by-products of combustion." Read the report here. At 600 to 900 hours, the engines began to burn more oil and lost compression. Shell Oil tested all-synthetic oils in aircraft engines, and what they found wasn't good. There are some synthetic blend oils used in aircraft engines, but they aren't as common. Unlike mineral and AD oil, synthetic oil is not made from whole crude oil. However, AD oils have added chemicals (additives), which collect debris inside the engine and carry them to the oil filter. Both types are made of mineral oil - a refined, petroleum based oil. There are two main oil types used in aircraft engines: mineral oil and ashless dispersant (AD) oil. Oil Types - Mineral, Ashless Dispersant, And Synthetic We did some research, and here's what we found. There's a lot of discussion about what oil is best to use for your aircraft engine. ![]()
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