To avoid the ecoboost 3.5L timing chain issues, choose a quality synthetic oil of sufficient viscosity and change it frequently. I suggest no less frequent than every 5000 miles. The 3.5 EB will easily last 300,000 miles with proper treatment. It won't make 100K with poor choices.
Yes, I know the BITOG crowd loves uber thin oil and extended oil change intervals. And proponents have excellent UOA results to back up their claims. However, real world results show that nearly all manufacturers have had trouble (often within the warranty period) by such practices. From BMW to Kia, Hyundai, Ford, GM, VW, Toyota and on and on. Micro particulates are hard on chains, non synthetic oils clog up piston drain holes, and low tension piston rings lose seal easily with only minor wear. Fuel dilution due to direct injection only makes the situation worse.
Note: Industrial testing show chains last longest with a true 30 viscosity oil that is particulate free.
The oil change is the only way micro particulates are removed from the engine. Filters only remove larger contaminates.