i have kia Rio 2013 model. Recently i feel engine getting over heating. Also few oil particles are attached on the engine head cover. I check with mechanic and he said it has no relation with engine heating. As per mechanic as long as no overheat sign in dashboard they can't do anything. But still my car getting heating compare to previous month and compare to any other car. My Radiator is brand new, oil changed, coolant is full on both radiator and tank. I am looking forward to hearing from you.