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Engine Oil Codes Explained SAE Society of Automotive Engineers numbers by Craig Kirkman
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VISUALLY EXPLAINED • Engine Oil Codes 'Explained' • Understanding engine oil codes is essential for choosing the right oil for your vehicle's engine. The codes often appear on oil containers and are designed to provide important information about the oil's characteristics. The most common coding system is represented as something like 5W-30 or 10W-40. Let's break down what these numbers mean: • Viscosity Grade: The letter W in oil codes stands for winter. The number preceding the W (e.g., 5W or 10W) indicates the oil's cold temperature viscosity, which is its ability to flow at lower temperatures. The lower this number, the better the oil's performance in cold weather. • Multigrade Oils: The second part of the code, after the hyphen (e.g., 30 or 40), represents the oil's viscosity at high temperatures. Higher numbers indicate thicker, more viscous oil that is better suited for high-temperature conditions and heavy loads. Lower numbers represent thinner, lighter oils suitable for lower temperatures and fuel efficiency. • The SAE Rating: The Society of Automotive Engineers (SAE) assigns these codes to oils based on their viscosity characteristics. For example, 5W-30 oil has better cold-weather flow properties and high-temperature stability compared to a single-grade oil with a rating of 30. • Benefits of Multigrade Oils: Multigrade oils, like 10W-40, are versatile and can adapt to temperature fluctuations. They are ideal for modern engines that experience varying conditions. They provide adequate cold-start protection while maintaining a stable viscosity at high operating temperatures. • Engine Oil Viscosity 'Explained' • Oil viscosity refers to the thickness or resistance to flow of an engine oil. Understanding oil viscosity is crucial because it impacts an engine's performance and longevity. Viscosity is typically measured at two temperatures, 40°C (104°F) and 100°C (212°F), and is represented as XW-XX, such as 5W-30 or 10W-40. Here's a detailed explanation: • Cold Temperature Viscosity (Before the W ): The first number (e.g., 5W or 10W) signifies the oil's low-temperature viscosity. Lower numbers mean thinner, more fluid oil that flows better in cold conditions. This is crucial for easy engine starts in colder climates, as it ensures that oil can reach engine components quickly. • High-Temperature Viscosity (After the W ): The second number (e.g., 30 or 40) indicates the oil's high-temperature viscosity. Higher numbers represent thicker oils that maintain their viscosity under high temperatures, making them suitable for hot weather or heavy loads. • Shear Stability: A good quality oil maintains its viscosity throughout its life. Oils with good shear stability resist thinning under the mechanical stress of the engine. Thin oil may not provide adequate lubrication, potentially leading to engine damage. • Choosing the Right Viscosity: Selecting the right oil viscosity depends on your vehicle's engine, climate, and intended usage. Consult your vehicle's owner's manual for the manufacturer's recommendations. Using the wrong viscosity can lead to insufficient engine protection and poor performance. • In summary, understanding engine oil codes and viscosity is essential for selecting the right oil to protect your engine in various conditions. Always follow the manufacturer's recommendations for the best engine oil choice, ensuring proper lubrication and engine longevity. • • Thank you • Craig Kirkman (owner and creator of The Repair Specialist channel) on engine oil #lawnmower​ #gardening​ #repairing​ #savingmoney​ #chainsaw #Chainsawrepair #oil #smallenginemachines #DIY #howthingswork #lawnmower​ #gardening​ #repairing​ #savingmoney​ #chainsaw #Chainsawrepair #oil #smallenginemachines #DIY #howthingswork Please check out my amazon shop. I have recommended some useful items from Amazon below. I guarantee you that these items are the sorts of things I use on a daily basis so I know they are good. I have to be careful in recommending products because I have my name and credibility at stake. So I will only recommend good products. https://www.amazon.co.uk/shop/therepa... • #EngineOilExplained • #ViscosityDemystified • #OilCodes • #ChooseTheRightOil • #EngineMaintenance • #VehiclePerformance • #AutoCare • #OilViscosity • #MotorOil • #EngineProtection • #MaintenanceMatters • #AutoMechanics • #SaeRating • #LubricationBasics • #EngineHealth • #AutoTips • #ViscosityRatings • #ColdWeatherOil • #HotWeatherLubrication • #VehicleCareTips
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