I don't know kschachn, as I am no way a mechanic but I received this car back in 2014 when my aunt passed away and it had less than 34,000 miles on it. I did a complete change of all the fluids including a radiator flush plus replaced the thermostat with a brand new Motorcraft stat . Radiator fluid was pretty dirty then but flushed clean and I had no problems. In 20016 I flushed again and installed a brand new motorcraft water pump , idler pulley and tensioner along with a brand new belt. It was here when I started to have temp issues as it would just shoot up within 20 minutes of driving . I never overheated but it made me very uneasy . I had two different mechanics check on it and both said it was fine but I just kept seeing much higher operating temps than I had seen before and I had no loss of fluid in the reservoir tank so I was baffled. That is how I came to use RMI and you are probably right it probably did not help like I think it did .