If it is too high, the machine will struggle to pump the oil, resulting in loss of energy. In variable climate zones, drivers who use single viscosity oils generally change to a higher numbered grade for summer driving and a lower numbered grade for winter.

They ensure that the engine is free of corrosion, clean, and cool. =0) {%>, Disclaimer: Always consult your vehicle manufacturer's manual for information specific to your automobile. It is designed to offer maximum protection for engines that exceed the 75,000 marks. The second part of the grade (30) is the grade of the comparable single viscosity oil that defines its viscosity at 212 degrees Fahrenheit.
2. AMSOIL 5W-30 Synthetic Motor Oil (ASL) and Mobil 1 SuperSyn 5W-30 Motor Oil were analyzed in five key bench tests measuring motor oil performance: NOACK volatility, flash/fire point, pour point, four ball wear and total bas number (TBN). SAE established the grading system, which includes a numerical code system.
The “W” in the gear oil viscosity grade is for winter grade, like in engine oil viscosity.

Polymers expand when heated, so the oil actually maintains its viscosity to the point where it is equal to what a hot SAE 30 oil would be. Every oil can you will come across is marked with a viscosity grade number. This particular oil helps to protect engine parts from wearing for up to 500,000 miles. The higher the number, the thicker the oil and vice versa. For automotive gear oils, the specification is referred to as SAE J306. As earlier mentioned, SAE stands for Society of Automotive Engineers. Here is another interpretation of how to read oil viscosity (SAE 10W-30), 10W = the viscosity of the oil when measured at 0 degrees Fahrenheit (the “W” means winter grade), 30 = the viscosity of the oil when measured at 212 degrees Fahrenheit. Therefore, if you purchase an engine oil that features API SA rating, then you will be buying an oil that was manufactured for automobiles designed in the 1920s.Although most vehicles in the US are required to use engine oils that meet a particular API service category, there are some automobile makers who need drivers to use motor oils that meet OEM specific performance specifications. The relationship between the viscosities of fluid at 40 degrees Celsius and 100 degrees Celsius is the viscosity index. Depending on the coldest temperature the oils are exposed to; they are given the following SAE viscosity grades: 25W, 20W, 15W, 10W, 5W, or 0W. The best course of action is to switch to a heavier straight weight oil in order to keep the oil thick enough to fill the gaps. We offer a wide selection of Mobil™ 5W-30 viscosity motor oils, including products designed for high mileage vehicles, trucks and SUVs, and for those of you looking for an extended drain motor oil. When cars were first engineered, they required API SA, from there they progressed to SB then SC followed by SD and others. 100 outside air temp?


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