Angela, the only added potential repair issues with the turbo engines is rebuilding/replacing the turbos themselves. The Ford turbos are quite reliable and have been trouble-free for those people who change oil religiously and who use good oil (Motorcraft semi-synthetic or synthetic, or other high-quality oils). Unless your father still thinks of himself as a 25 year old race car driver, I would not worry about the 2.0 EcoBoost v. the 3.5 from a maintenance standpoint.