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When oil is too low in viscosity at normal operating temperatures, its ability to provide an adequate lubricating film between moving parts is compromised. Viscosity refers to the thickness or resistance to flow of the oil; lower viscosity means the oil is thinner. In this state, the oil cannot effectively maintain a protective layer, which leads to increased metal-to-metal contact. This heightened friction results in accelerated wear of engine components, leading to potential damage and decreased engine efficiency. Hence, the primary outcome of low viscosity at normal operating temperatures is that the oil becomes thin, significantly increasing wear on the engine parts.

While solidification, evaporation, or contamination might affect oil performance, they are not the most immediate concerns in relation to low viscosity under normal temperatures.