What grade oil do you use for peugeot 407 hdi?

For a Peugeot 407 HDi, it is generally recommended to use oil that meets the specifications of ACEA C3 or API SN, with a viscosity grade of 5W-30 or 5W-40. Always check the owner's manual for specific recommendations based on the engine type and local climate conditions. Using the correct oil ensures optimal engine performance and longevity.