Oil viscosity, a parameter so important to the proper functioning of an engine, is to oil what the coefficient of friction is to metal parts rubbing against each other.
Engine manufacturers, in cooperation with oil producers, develop assumptions to protect surfaces in metal-to-metal contact and to maintain oil viscosity for as long as possible during the oiling interval. Unfortunately, this difficult art does not always yield satisfactory results. But what is this oil viscosity?
Oil viscosity is a parameter that characterises the resistance to flow that a fluid puts up. The fluid's resistance to movement depends on the structure of its molecules and is directly responsible for the magnitude of the forces that must be applied to force the flow.
Very importantly, the viscosity of oils decreases with increasing temperature. For this reason, we take care in our products to ensure that those used in car engines are not only miscible with the widest possible range of oils, but also that the viscosity of the oil itself is not significantly affected. Below is a link to tests carried out by the certified Ecol laboratory on the effect of the Ultimate Metal Guard additive on the kinematic viscosity of the oil. For the tests, we used Castrol Edge 5W30 and Elf Evolution 700 STI 10W40 oils.
