What is the engine oil specification for Citroen C5?

[LeAmy]

The Citroen C5 can use semi-synthetic or higher-grade engine oil with a viscosity of 5W-40. Here is some information about automotive engine oil: 1. Engine oil, also known as engine lubricant, serves multiple functions including lubrication and wear reduction, auxiliary cooling, sealing against leaks, rust and corrosion prevention, and shock absorption. 2. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of lubricants, determining their fundamental properties, while additives compensate for and enhance the performance of the base oil, providing additional characteristics and making them an essential part of lubricants. Additional information: 1. The SAE viscosity grades for winter oils are: 0W, 5W, 10W, 15W, 20W, 25W. The 'W' stands for winter, and the smaller the number before 'W', the lower the viscosity at low temperatures, the better the low-temperature fluidity, and the lower the applicable minimum temperature. 2. The SAE viscosity grades for summer oils are: 20, 30, 40, 50. The larger the number, the higher the viscosity and the higher the applicable maximum temperature.