Do not add anything to the oil. The recommended oils meeting the dexos specification are all that is needed for good performance and engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
Crankshaft and Bearing Installation Engine Block Cylinder Block Crankshaft
Special ToolsGE 6125-1B Slide Hammer AdapterEN 45059 Angle MeterEN 49102 Crankshaft Bearing Cap RemoverFor equivalent regional tools, refer toSpecial Tools.Crankshaft Bearing Installation ProcedureNote:If the crankshaft bearings have been used in a running engine, you must replace themwith NEW crank ...