Before using any engine oil, it’s essential to know the difference between engine oil’s viscosity. The figures for 5W30 and 10W30 represent the viscosity level of the engine oil. Now, 5w30 would certainly perform better than the 10w30 engine oil. That’s because its low viscosity will help the engine perform equally well in all types of conditions. Also, low viscosity engine oil helps the engine stay in good condition.