HI all sifu, needed advise on the engine oil,

i get my wira 1.3 mmc injection spec year 2001 for pass 6month, once i get it i has changed the car engine oil with 20w-40 and then on the last february 2015 before CNY i changed the engine oil with 15w-40.

so can i be used for 10w-40 engine oil?

i just want my engine silent, has a good pick up and not feel heavy with the engine when on highway with 100km per hour.