Castrol Edge 0W-40 Car Engine Oil

Castrol's full synthetic 0W-40 motor oil has been liquid engineered to flow like 0 Weight oil in winter temperatures, but to have the viscosity of a 40 Weight engine oil once full operating temperature has been achieved. This ensures a high level of engine protection from the moment you turn on the ignition. You might think that the 'W' in a motor oil's viscosity description stands for Weight, but that's just a common misconception. It actually stands for Winter. That's because 0W-40 engine oil is formulated to flow like a 0 Weight oil in cold conditions, yet offer the protection of a 40 Weight motor oil when the engine reaches its full operating temperature.