![]() ![]() For example, an ISO 680 lubricant will have similar viscosity to an AGMA Grade 8 or SAE 140 gear oil. If you are used to working with one set of standards and suddenly get another thrown at you, this chart can provide a point of reference. Example SAE 10W-40 where 10W refers to low-temperature - or winter - viscosity and 40 refers to the high-temperature - or summer - viscosity. Lube oils can be multigrade or monograde where multigrade oils fulfills two viscosity specifications. So what’s the point of the chart? Basically, it allows users to determine whether or not lubricants will have similar viscosities. Viscosity of lube oil is determined by the Society of Automotive Engineers (SAE). Listed below them are the viscosity grades for these standards. These are ISO Viscosity Grades, American Gear Manufacturers Association (AGMA) grades, SAE crankcase oil grades and SAE gear oil grades. SAE 5W30 viscosity engine oil should be used. Engine Oil SAE Viscosity Temperature-20 o F (-29 o C) 0 o F (-17.8 o C) 20 o F (-6.7 o C) 40 o F (4.4 o C) 60 o F (15.6 o C) 80 o F (26.7 o C) 100 o F (37. The numbers in the middle will most likely look a bit more familiar. The recommended oil viscosities for sustained temperatures ranging from below 0F. Still, it is commonly cited in lubricant product information. The measurement is specified by ASTM D2161, but is largely considered to be obsolete. ![]() ![]() These measurements refer to the results of a specific test producing measures of kinematic viscosity. So a value of 90 to 110 would be considered an ISO VG 100. Put simply an iso VG 100 is 100mms/2 (mm2/s is also known as cSt in the imperial system naming) +/- 10. Definition of an ISO VG grade by Learn Oil Analysis. On the other side, you have Saybolt Viscosities. An ISO VG grade is the viscosity in mm2/s at 40’C +/- 10. Usually, these are tested at ☄0 and ☁00 Celsius and are almost always shown on product data sheets. It’s the most common unit of measure for viscosity and is expressed in cenistokes (cSt). It’s a measure of a fluid’s internal resistance to flow and shear under the force of gravity. Let’s take a closer look:įirst, let’s talk about kinematic viscosity. Low ash technology to support Diesel Particulate Filter (DPF) service life. Established to represent a universally accepted grading system (e.g.Viscosity grade comparison charts like this one are relatively easy to find, but they can be a bit difficult to understand. International Standards Organization (ISO) grades for hydraulic fluids and industrial gear lubricants. ![]() SAE 75W-90)Īmerican Gear Manufacturers Association (AGMA) grades for industrial gear lubricants (e.g. Society of Automotive Engineers (SAE) grades for automotive gear oils (e.g. Society of Automotive Engineers (SAE) grades for automotive motor oils (e.g. Saybolt viscosity is usually tested at both 100F and 210F. More specific classifications give us a better idea of how fluids move, but you’ve likely seen at least a few different ways to designate viscosity: For example, an SAE 60 motor oil has a similar viscosity to an SAE 90 gear. However, these terms are general and difficult to measure. Terms such as thick, heavy or high suggest a fluid with strong resistance to flow, such as honey. Some of the informal terms used to describe the viscosity of a relatively free-flowing fluid, such as water, include thin, light and low. Viscosity, defined as a fluid’s resistance to flow, is one of the most important characteristics of a lubricant. ![]()
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