5. What is the viscosity of a lubricant?

        Viscosity is the resistance of a liquid to flow. For the case of lubricants, it is essential to take viscosity into account when selecting which is the best product for you. Vehicle manufacturers are responsible for establishing the most adequate viscosity for their different models, which is usually included in their manuals. Generally, several viscosities are recommended since it may be necessary to adapt the viscosity to the vehicle's usage conditions and the weather conditions. Viscosity is not indicative of the quality or suitability of the oil. It is just one of the properties to take into account when choosing a lubricant. However, the quality level is what sets one lubricant's properties apart from another. These quality levels are usually indicated on the label. It is not advisable to mix lubricants with different viscosity levels. You should only do this if it is absolutely necessary, such as refilling when the oil level is low.