GB/T 14906-2018 in English
VALIDClassification of internal combustion engine oils viscosity
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 14906-2018内燃机油黏度分类》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
Introduction
In-depth interpretation of GB/T 14906-2018 National Standard of the People's Republic of China Viscosity Classification of Internal Combustion Engine Oils
Background of Standard Revision and Analysis of Technical Evolution
GB/T 14906-2018 "Viscosity Classification of Internal Combustion Engine Oils" replaces the previous GB/T 14906-1994 version, and is mainly revised to meet the higher requirements of modern engines for lubricant performance. The new standard introduces more stringent low-temperature starting and pumping performance test methods, and adds viscosity test items under high temperature and high shear conditions.
| Viscosity Grade | Low Temperature Starting Viscosity (mPa·s) | Low Temperature Pumping Viscosity (mPa·s) | Kinematic Viscosity (100℃) mm²/s | High Temperature High Shear Viscosity (150℃) mPa·s |
|---|---|---|---|---|
| 0W | ≤6200（-35℃） | ≤60000（-40℃） | ≥3.8 | - |
| 5W | ≤6600（-30℃） | ≤60000（-35℃） | ≥3.8 | - |
| 10W | ≤7000（-25℃） | ≤60000（-30℃） | ≥4.1 | - |
Classification method and brand representation
The new standard adopts two groups of viscosity grade series, with and without the letter W. Single-grade oil is divided into low-temperature starting viscosity, low-temperature pumping viscosity and 100℃ kinematic viscosity, and multi-grade oil must meet both W-grade low-temperature performance and non-W-grade high-temperature shear performance.
Implementation Suggestions
1. When selecting lubricating oil, it is necessary to select the appropriate viscosity grade according to the engine's operating environment and working conditions. For example, multi-grade oil with low W grade should be preferred in extremely cold areas.
2. Use GB/T 6538 to test low-temperature starting viscosity and boundary pumping temperature to ensure the performance of lubricating oil under extreme conditions.
3. For high temperature and high shear conditions, it is recommended to use SH/T 0751 method to meet the needs of high-performance engines.
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