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  5. 0W-40

0W-40

Castrol's 0W-40 engine oils are all premium full synthetic and are typically designed for use in European performance cars requiring an ACEA specification.

0W-30

Selecting the correct 0W-40 motor oil for your engine

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.

 

This is important, because it means that full synthetic 0W-40 oils like Castrol® EDGE® can flow quickly and easily to protect engine components right from start-up even in cold temperatures yet offer the protection of a thicker viscosity to withstand the pressure demanded by modern engines once fully warm.

Castrol EDGE 0W-40

Castrol EDGE 0W-40 gives you the confidence to demand maximum engine performance from today’s modern, higher revving sports performance and luxury vehicles requiring lower viscosity higher performance oils.