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Oil with a higher viscosity than 5W30 includes 10W30, 10W40, 15W40, and 20W50. The oil viscosity or thickness is crucial for optimal performance and protection of the vehicle's engine. The larger the viscosity numbers, the thicker the oil and the greater its resistance to flow. For instance, 5W-30 oil is thicker than 5W-20. The higher this number, the more protection the oil provides when dealing with extreme heat and pressure. 10W40 is thicker when the temperatures rise. The number before 'W' is the low-temperature oil viscosity, measured at -17.8°C (0°F), simulating the vehicle startup conditions in winter. The lower this number, the thinner the oil in low temperature settings.
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