... and the import base oil featuring low-viscosity and high-index through the hot melt, shear and other technology. Its strong ... .≤1.0GB/T6540Thickening ability mm2/s≥7.0SH/T0556Shear stability index≤15SH/T0103Water content, % traceGB/T260Mechanical impurities, % ≤0.05GB/T5115. Storage ... .(2) The test method of shear stability: ultrasonic detector. T615CViscosity index improver