If its a 1.0 Ecoboost, he's probably referring to the "belt in oil" system they have....worst idea ever!!! The tiny bits that wear off the belt block the oil ways and filter pickup if you don't change the oil VERY regularly. I don't know about your car....(someone will!) but even if its belt driven it wont be one in oil. Belts are fine as long as you change them at the correct interval. Chains last longer in theory.....but on modern engines with thin chains and long OCIs its not usually the case.....and belts are LOTS more expensive to change than belts and involve a lot more work. Belts are quieter and more efficient too. DIYed the belt on my car in under three hours...which included a lot of cleaning and painting that a proper fitter would not do....two hours would be easy as a straight belt, tensioners, pulleys and water pump change.