206 hdi oil selection

km maintenance has come, castrol is a little expensive, mobile 5w 40 (3000) think good? What is the difference between 5w40 and 10w40, which one should I use?

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I have always used 5w40 full synthetics on my old diesel vehicle, the following link also has recommendations.

As a peugeot master for a diesel vehicle, I recommend a total of 5w-40, but the oil may vary depending on your vehicle model and km.