An Evaluation of a Cold Cranking Simulator for Oil Viscosity at Sub-Zero Temperature

Abstract

<p>An experimental evaluation of the cold cranking simulator at -20°C is reported in this thesis. The evaluation was made on eight special research engine oils, ranging in viscosity grade from SAE 5W to SAE 20W, including multi-grade oils, and seven specially blended 5W30 oils of commercial nature. Repeatability and accuracy were analyzed statistically and correlations were made with other viscosity measurements on the same oils, including an engine cranking evaluation of the oils. The viscosities determined by the cold cranking simulator were found to correlate well with those from the engine cranking tests and a relationship between measured viscosity and engine cranking speed was established.</p>