Just an Update:
Recently bought a Cultus Euro II (2013).
the previous owner perhaps using 10w40 (SM or SN) grade oil.
The pick up and acceleration was great.
After researching on ZDDP , today I decided to change oil to SGO 10w40 Premium, and gear oil to SGO SAE90.
The sudden effect I noticed :
1- lack of pickup
2- delayed acceleration, not quick as before
3- if you press the accelerator on idle , before it was smoothly going to 6000-7000 RPM, now after oil change, it is going till 6000 max with a lot of struggle, delay and noise.
I hope the things will be good after some days. I will update this threads for other members.