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To drain the oil, you have to disconnect the lower hose from the radiator. To remove it, you have to hold the metal clip. In my case, I also cleaned the expansion tank, so I removed it as well. For a Renault, you need yellow coolant, but if another color is present, put the same one back. The operation itself is simple, but for me it was the metal clips that made the operation last... To do this correctly, expect to immobilize your vehicle for several hours to be able to top up the level. — Mathieu & Cars —