One problem related to engine belts and pulleys has been reported for the 2010 Mercury Milan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Mercury Milan based on all problems reported for the 2010 Milan.
I was traveling at a high rate of speed (70mph) when my engine began to "stall out" on me causing a rapid deceleration. I would say it stalled, but it did not 100% cutout, rather it went into the lowest limp mode on the engine. Luckily, since it was a busy time of night (approximately 6pm), I was in the right hand land and was able to pull off before being rear ended. . . Though it would almost inevitably happened had I been in any other lane. I was near an exit and coasted slowly in the limp mode and made it to a parking lot, where I turned off my car and popped the hood to examine the issue further. The oil was within range and belts were ok. Just as I was finishing the coasting, I saw the "wrench" light illuminate. After checking the engine, I was able to re-start my car and drive home without incident. I looked up the issue online & found many others with the same issue. I ordered oem replacement parts that took about a week to arrive. Over the course of that week, the issue occurred several more times and happened more and more frequently. I avoided highways altogether for safety concerns. I contacted Ford who told me I could have it repaired at my cost at a dealership (since I was a few thousand over the powertrain warranty). I bought oem parts & did the repair myself and the issue has not happened again since. This is the exact issue listed in NHTSA action number: pe13003.