Can You Add Engine Oil to a Hot Car?

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You can add engine oil to a hot car. When changing the engine oil, if the vehicle has been parked for a while, it is common practice to warm up the car before replacing the oil, typically when the oil has reached a certain temperature. Changing the oil while the car is warm helps to drain the old oil more thoroughly. When the oil is at a certain temperature, it softens some of the sludge inside the engine, allowing this softened sludge to flow out along with the old oil through the drain plug. Engine oil is the lubricant used in engines, composed of base oil and additives, and is often referred to as the 'blood' of a car. It mainly contains anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers.