I actually had a similar thing happen to me in my 2013 Edge while driving up a steep hill. About half way up I had to press the brakes, and after I went to push the gas again the "low engine oil" indicator flashed on and it shut the vehicle off. I also lost the ability to steer but luckily I was able to coast backwards down the hill with the brakes. It started right back up and hasn't happened since, and I checked the oil later that day and it was still full. I didn't get to bring it in that day but I plan on stopping in this week to see if they can pull the code to troubleshoot. Definitely not what you want to happen while driving. Luckily, it was in a nearby residential area when it happened.