![]() Fluids that are thin have a low viscosity, and fluids that are thick have a high viscosity. The Society of Automotive Engineers (SAE) has developed a rating system to classify oil viscosity, such as 5W-30, 10W-30 and 15W-40. Conventional engine oil contains additives to help with fuel economy and protection against corrosion and wear meeting basic OEM performance standards. KLONDIKE Synthetic Blend High Mileage Engine Oils are designed for use in passenger cars and light trucks that have exceeded 120,000 kms Conventional Engine OilĬonventional engine oils are usually the most economical option since they require less refinement and re-engineering. Synthetic blend engine oil uses a combination of synthetic and conventional base oils for added resistance to oxidation and wear compared to conventional engine oil. Higher performing engines with higher efficiency generate more heat and full synthetic engine oils help resist heat induced oxidation and deposit buildup inside the engine. Full synthetic oils use higher quality base oils, are processed to remove all impurities, and are customized with higher performing additives compared to conventional oils.įull synthetic engine oils are the preference of OEM’s, making up the vast majority of factory fill engine oils today. Types of Engine Oil Full Synthetic Engine Oilįull synthetic engine oil will deliver maximum protection and performance with superior low and high temperature performance even in extended high stress service conditions.įull synthetic engine oil has gone through a chemically engineered process. KLONDIKE takes no responsibility for product misuse or misapplication. All you need is the make and model of your vehicle, equipment, or machinery.Īlways follow OEM recommendations for fluid viscosity and API service category. You know where the dipstick is but what does the viscosity of engine oil mean? How do you know if it is the correct oil for your vehicle? The LUBE-LINK oil and lubricant database is a great tool to start with before discussing with a qualified mechanic, it allows you to find the right oil quickly and effortlessly. High-VI fluids can also improve the energy efficiency of a machine.Understanding Engine Oil – Viscosity and Classifications Explained But when conditions are not constant-such as in mobile equipment that must operate from winter cold to desert heat-and loads, speeds and temperatures vary, many OEMs recommend high-VI fluids that help maintain near-optimum viscosity over a wider temperature range. Here, the viscosity index is not so important: Just choose the suitable monograde viscosity recommended for the application. Too thick and the machine is hard to start and has low mechanical efficiency, and can even lead to problems like cavitation.Īlthough oil viscosity changes with temperature, that’s not so important in machines that run at constant load and speed and at constant temperatures. When viscosity is too low and fluid too thin, users will see problems like higher wear and overheating. Experts often recommend shear-stable additives to ensure high-VI fluids work as intended.Īlso remember that it’s important to use a fluid with the recommended viscosity when running a machine. Such action can, over time, break down the polymers and degrade fluid viscosity. However, viscosity improvers can be susceptible to mechanical shearing. But at higher temperatures, the polymers expand and that helps increase viscosity. At low temperatures, the polymer chains in the modifiers contract or fold and don’t have much effect on fluid viscosity. These modifiers are temperature sensitive. ![]() Synthetic oils usually have a higher VI than do mineral oils.įluid manufacturers can improve the viscosity index of base oils by using polymer additives to form multigrade-viscosity oils. Highly refined mineral oils with few contaminants tend to have higher VIs, all things being equal. Standard ASTM D2270 calculates viscosity index in part by measuring a fluid’s kinematic viscosity at 40° and 100° C. ![]() That, in turn, means consistent, high performance from a machine. The best oils with the highest VIs remain stable and don’t vary much in viscosity over a wide temperature range. Typical mineral-oil fluids used in hydraulics have a viscosity index of around 100, although products range from below 100 to well beyond 200. High-VI fluids, in contrast, are less affected by temperature changes. Thus, a fluid with a low viscosity index will experience a relatively large swing in viscosity as temperatures change. (It also applies to fluids like engine and automatic transmission oils, gear lubricants, and power-steering fluids.) The greater the viscosity index (VI), the smaller the change in fluid viscosity for a given change in temperature, and vice versa. Viscosity index is a dimensionless number that represents how the viscosity of a hydraulic fluid changes with temperature.
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