1.1 This test method covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a period exceeding 45 h to a final test temperature between -10 and -40°C. The precision is stated for test temperatures from -40 to -15°C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4 to 15 s-1. The viscosity as measured at this shear stress was found to produce the best correlation between the temperature at which the viscosity reached a critical value and borderline pumping failure temperature in engines.
Product Details
- Published:
- 12/01/2012
- Number of Pages:
- 14
- File Size:
- 1 file , 150 KB
- Redline File Size:
- 2 files , 300 KB
