Some Factors Affecting the Cold Pumpability of Crankcase Oils

Selection of Pour Point Depressants for Todays Engine Oils including Aging in the Presence of Biodiesel by CEC L-105

“…These studies led to pumpability being introduced into SAE J300 and evaluated via ASTM D4684. It was by now widely accepted that Pour-Point, CCS and other low temperature tests didn't predict an oil's tendency to pumpability failure, and studies exist which directly demonstrate such [3], [4]. The cooling profile used to determine pumpability by Mini Rotary Viscometer (MRV) as described by ASTM D4684 is run for approximately 2 days (actual time dependant on the SAE J300 "W" grade) and has a cooling rate of 0.…”