what we have to care about is that the oil is not used only for cars but also other materials .
What we have to care about is that the oil is not used only for cars , but also for other materials . What we have to care about is that the oil is not used only for cars , but also for other materials . What we have to care about is that the oil is not used only for cars , but also other materials . What we have to care about is that oil is not used only for cars but also for other materials .