Abstract
The pumpability of various engine oils at low temperatures has been investigated using a Haake-Rotovisko RV2 viscometer, a test engine and a laboratory pumping rig. The cold flow and cold pumpability properties of polymer-thickened engine oils can be predicted from the flow curves at low temperatures. Correlation was found between viscosity data and the cold pumpabiiity behaviour of an oil in an engine. The best evaluation of the low temperature pumpability of multigrade oils in the engine used was given by a specially developed laboratory pumpability rig.
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