Drive now for almost three years the C1 petrol engine. Have since the 70100 km on the speedometer. My question to you. When should one replace the control chain / water pump? Are there other important parts that must be changed? I changed in time only 2 bream lights and at the front right the Simmerring. My oil change intervals were at: 1. 15,000 km (at Citroen) 2. 44,000 km (at ATU) 3. 70,000 km(at ATU) As oil I use 5W40. Because of the warranty I have at 15,000Km made only the only service at Citroen. Since then only refuel and drive. Ask for numerous comentars.