Further Considerations of Low-Temperature, Low-Shear Rheology Related to Engine Oil Pumpability-Information from The Scanning Brookfield Technique 852115

The Scanning Brookfield Technique (SBT) is used to examine the nature of air-binding, pumpability problems. Causes of the failure of the first ASTM pumpability test methods are examined and used to caution present and future assumptions subtly but markedly affecting test method development.
The engine itself may, by its design, be super sensitive to the occurrence of even moderate oil gelation, raising the question of gelation-prone oils vs. gelation-sensitive engines.
Dialysis experiments showed that oil additives could sometimes cause gelation as well as prevent it.


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