The purpose of this test was to see if the oil monitoring system range was too far or not. The computer will go a set range of about 7400 miles before it gets to 0% oil life. We had a 2010 Fusion and Milan, identical engine. The Milan seemed to make a light knocking noise when cold, much louder when loaded (accelerating). The Fusionís engine did not make the same noise, even though it was much higher mileage. The Milan had about 60k miles on it before I started paying attention to the noise, I donít know if it always made it.
When higher sodium and iron levels came up in the oil analysis, I became worried. Fuel was higher as well but I was very careful to make sure the car had been driven and was at operating temperature when sampling. A cold compression test found all the cylinders to be the same. I also noticed I had to top the coolant off only a tiny bit now and then (almost unnoticeable). They said sodium could have been from a previous fill of an oil that used that as an additive, but I could not remember the oil that was in it before.
Sorry I donít have a video of the noise, but it seemed like top end. And was unnoticeable when the engine was hot. I have seen that these 2.5L blocks can crack, either between cylinders to into water jackets. We no longer own the car, but Iím posting the report in case anyone is curious.