This standard specifies the viscosity classification of internal combustion engine oils to determine the viscosity grade of internal combustion engine oils. GB/T 14906-1994 Viscosity classification of internal combustion engine oils GB/T14906-1994 Standard download decompression password: www.bzxz.net

UDC 621.43:665.73:665.75:532.13:006.72E30
National Standard of the People's Republic of China
GB/T 14906—94
Viscosity classification of internal combustion engine oil
Issued on 1994-01-02
Implemented on 1994-10-01
Issued by the State Bureau of Technical Supervision
National Standard of the People's Republic of China
Viscosity classification of internal combustion engine oil
1 Subject content and scope of application
This standard specifies the viscosity classification of internal combustion engine oil to determine the viscosity grade of internal combustion engine oil. 2 Reference standards
GB/T265 Determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products GB/T6538 Determination of apparent viscosity of engine oil (cold start simulator method) GB/T9171 Determination of boundary pumping temperature of engine oil SH/T0562 Determination of yield stress and apparent viscosity of engine oil at low temperature 3 Classification method
GB/T 14906--94
This classification standard only establishes the viscosity classification of internal combustion engine oil from the perspective of rheology, and does not involve other characteristics of oil. This classification standard adopts two groups of viscosity grade series with letter W and without letter W. The former is divided by the maximum low temperature viscosity, the highest boundary pumping temperature and the minimum kinematic viscosity at 100℃, and the latter is divided only by the kinematic viscosity at 100℃. A multi-viscosity internal combustion engine oil, its low temperature viscosity and boundary pumping temperature meet the needs of a W grade in the series, and the 100C kinematic viscosity is within the viscosity range specified by a non-W grade classification in the series. 4.1 In this standard, the viscosity grades are indicated by six low-temperature viscosity grades containing W (0W, 5W, 10W, 15W, 20W, 25W) and five 100℃ kinematic viscosity grades without W (20, 30, 40, 50, 60). 4.2 Viscosity grades are divided into single-grade oil and multi-grade oil. Any Newtonian oil can be marked as a single-grade oil. Some products with multiple viscosity grades prepared with polymer viscosity index improvers are non-Newtonian oils and should be marked with appropriate multi-viscosity grades, that is, the low-temperature viscosity grade containing W and the 100C kinematic viscosity grade, and the difference between the two viscosity grades is at least 15. For example, a multi-grade oil can be marked as 10W/30 or 20W/40, but not as 10W/20 or 20W/20. A product may meet multiple W grades at the same time, and the marked W grade or multi-viscosity grade only takes the lowest W grade. For example, if a multi-grade oil meets the 10W, 15W, 20W, 25W and 30 grades at the same time, the viscosity grade can only be marked as 10W/30. Approved by the State Administration of Technical Supervision on January 2, 1994 and implemented on October 1, 1994
5 Viscosity classification of internal combustion engine oils
Viscosity grade number
Low temperature viscosity\, mPa·s
Not more than
Note: 1) Determined using the GB/T6538 method. GB/T 14906—94bZxz.net
Boundary pumping temperature\℃
Not higher than
—25 （
-·15℃
Kinematic viscosity\（100℃）,mm2/s
Not less than
Less than 9.3
Less than 12.5
Less than 16.3
Less than 21.9
Less than 26.1
2) For 0W, 20W and 25W oils, GB/T9171 method is used for determination. For 5W, 10W and 15W oils, SH/T0562 method is used for determination.
3) GB265 method is used for determination.
Additional remarks:
This standard is proposed by China Petrochemical Corporation. This standard is under the technical jurisdiction of Petrochemical Science Research Institute. This standard was drafted by the Petrochemical Research Institute. The main drafters of this standard are Yang Binglu and Liang Hong. This standard was formulated with reference to SAEJ300--1987 "Engine Oil Viscosity Classification" of the American Society of Automotive Engineers.
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