Oil viscosity or grade are interchangeable terms,you should know that.It is always recommended to follow viscosity recommendation of
the manufacturer as different engines have different oil clearance values.They test their built engines extensively and recommend a grade to be followed upon..Even the chart above relates that 10w40/10w50 oils can be used for the same climatic temperatures.What differs is that the latter is more thick than former at optimum temperature.Their flowability is different.The point is we should leave this matter to the experts.Every car has different requirements and we should follow what manufacturer quotes by book
Daewoo is OHC engine with hydraulic lifters/tappets.Idk about baleno but they are somewhat similar engines (non adjustable tappets) if you say so
FOr cars with lifters api sg/sf(enough zddp) grade oils can be used but one should stick to viscosity stated by manufacturer.