Viscosity classification

The classification of motor oils has not been completed in the ISO standard because the technical differences between motors in different parts of the world, particularly Europe and the United States, make the implementation of a single system of classification and specifications very difficult. In practice, different systems coming from national or international organizations are used. The best known is the SAE viscosity classification from the Society of Automotive Engineers, developed in the United States. 

Viscosity Glassifications. The general ISO iatemational viscosity classification system for iadustrial oils is given ia Table 4 from ASTM D2422 (American National Standard Z11.232). For high speed machines, ISO viscosity-grade 32 turbiae and hydrauHc oils are a common choice. ISO grades 68 and 100 are appHed for more load capacity ia slower speed machines where power loss and temperature rise are less of a question. 

Industrial nylon applications, 19 765-766 Industrial oil, viscosity classification and guide recommendations for, 15 237-239... 

AGM A specifications covering gear lubricants. The viscosity ranges of the AGMA numbers conform to the International Standards Organization (ISO) viscosity classification system (see ISO viscosity classification system). AGMA numbers and their viscosity ranges are as follows ... 

ISO viscosity classification system-international system, approved by the International Standards... 

SAE (Society of Automotive Engineers)—organization responsible for the establishment of many U.S. automotive and aviation standards, including the viscosity classifications of engine oils and gear oils. See SAE viscosity grades. 

After 1981, the low-temperature portion of the SAE viscosity classification system is to be superseded by a revised system, following an 18-month (1980-81) phase-in. The new system introduces the following key changes 1) two new grades are added—a 0W grade for... 

Viscosity classification In the description of SAE grade oils, such as SAE 5 W, does the W designate a viscosity that applies to warm or winter temperatures Which multigrade engine oil designation is incorrect SAE 5W-20, SAE 10W-50, or SAE 5W-10W-30 ... 

PAH PAJ PAO PCBs Polyaromatic hydrocarbons. Petroleum Association of Japan. Poly-a-olefin base stock of various viscosity classifications. Any of the chlorinated derivatives of biphenyl (also called diphenyl). 

Table 1. Engine Oil Viscosity Classification SAE J300 (April 1997)a...

A new proposed SAE Viscosity Classification not only reflects lower than 0°F temperature cranking characteristics of an oil, but also covers low temperature pumpability characteristics (j), 10). Low temperature cranking success without oil pump-ability could result in oil starvation and subsequent engine damage. This new proposed classification attempts to establish a maximum cranking viscosity and then classifies oils according to what temperature they match this viscosity. It also includes a low shear test (mini-rotor viscometer) to duplicate pumpability of the oil at various low temperatures. Needless to say, minimum... 

The viscosity of automotive engine oil is the main controlling property for manufacture and for selection to meet the particular service condition using the American Society of Automotive Engineers (SAE) viscosity classification. The higher-viscosity oils are standardized at 210°F (99°C), and the lighter oils that are intended for use in cold weather conditions are standardized at 0°F (-18°C). 

Stambaugh, R.L., Kopko, R.J. and Roland, TF. (1990) Hydraulic pump performance - a basis for fluid viscosity classification. SAE Paper 901633. 

The Society for Automotive Engineers (SAE) has developed a viscosity classification system for finished (i.e., not just the base stock) engine lubricants that defines viscosity ranges as well as low temperature properties. The 2004 SAE J300 grades are shown in Table 1.7.9... 

J300 Engine Oil Viscosity Classification, revised May 2004 (Warrendale, PA Society of Automotive Engineers). 

Per ISO 3448, Industrial Liquid Lubricants—ISO Viscosity Classification also ASTM D 2422 and British Standards Institution B.S. 4231. 

The most common name is neutral (N) which was derived in the days when the lube distillates were acid treated (sulfuric acid) followed by clay filtration. After clay treating the oil was acid free or neutral. The viscosity number in this example, 150 N, is the approximate viscosity of the base stock (Note the ASTM viscosity classification refers to an industrial oil grade system, not the base stock viscosity system) expressed in Saybolt Seconds Universal (SSU) at 100 F. 

The SAE viscosity classification of oils shown in Table 3-24 is most widely used. The lOW and 20W grades are for winter service. Perhaps... 

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