Its quite simple.
Never feed 5w oil to alto. Keep the min. viscosity as 10w. Now you have following options
Kixx G1, 10/40 Semi Synthetic. CI 5K
PTT 10/40, semi synthetic. CI 5K
Or if you want to cool down the unnecessary noise of engine, then use
SIM3 20/50. CI 5K.
PTT 20/50. CI 3.5K.
These are heavy oils and do good for noisy engines.
Now the summer already started, and as you mentioned in your previous message that many sounds comes from engine, then alongwith the engine oil, use 10% "oil treatment". Its just Rs. 240/440ml tin pack bottle. But only mix it 10%. It will make the engine cool as ice.