5w30 is a an engine oil mostly used in the new generation petrol cars for petrol and diesel engines. deo 5w30 can be used in the cars manufactured by hyundai which have a requirement of viscosities ranging from 5 to 40. When opposed to, instance, 10w30, 5w30 motor oil has a winter volatility grade of five, which means it’s less viscous (thick) at very low temperatures. It has a hot viscosity rating of 30, which indicates it is less viscous than a 5w50 oil at high temperatures. Servo deo 5w30 can be used in hyundai cars.