High fluidity allows to reduce friction allowing thereby to decrease fuel consumption and slightly increase engine potency.
Low pumping temperature, which means that the engine will operate without overloads at low outboard temperatures.
Synthetic oil has a high vaporization temperature, i.e. it is less sensitive to overheating.
Chemical stability of the oil is preserved almost during the entire lifetime since it is less oxidized and paraffin impregnated under engine operation.