What type of engine oil is suitable for the Citroën C5?
1 Answers
The original engine oil specification for the Citroën C5 is 5W30. The Citroën C5 can use semi-synthetic or higher-grade engine oil with a viscosity of 5W-40. Recommended oil brands include Mobil, Castrol, Shell, and Dusso Lubricants. The viscosity of engine oil changes with temperature, so special attention must be paid to its performance under both low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity—5W means it can withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, ensuring smoother cold starts for the vehicle. The second number represents the kinematic viscosity of the oil at 100°C. A higher value indicates better viscosity retention at high temperatures, which can also be understood as superior lubrication performance under high-temperature conditions. The method for changing the engine oil in a Citroën C5 is as follows: Wait for the engine temperature to cool down, allowing the oil to drain back into the oil pan. Loosen the drain plug with a wrench and collect the old oil in a container until no more oil flows out. Start the engine and let it run for 30 seconds to drain any remaining oil from the main oil passages. Remove the oil filter using a specialized wrench. Apply a thin layer of oil to the gasket of the new oil filter and tighten it clockwise by hand. Add new engine oil through the filler cap on the engine valve cover, typically filling about three-quarters of a standard oil container. Start the engine and let it run for 5 minutes, checking for leaks around the drain plug and oil filter. If any leaks are found, perform necessary repairs. After stopping the engine, pull out the dipstick to ensure the oil level is within the standard range.
