What type of engine oil does a Citroen C5 1.6 HDI use?

The Citroën C5 1.6 HDi typically requires a low-SAPS (Sulfated Ash, Phosphorus, and Sulfur) engine oil that meets the PSA B71 2290 or B71 2294 specifications. A commonly recommended viscosity is 5W-30 or 5W-40, depending on the specific model year and driving conditions. Always refer to the vehicle's owner manual for the most accurate specifications and recommendations.