Thanks for the details reply. First of All I am from Lahore, I have already visited a mechanic who removed the engine belt to disable the AC etc. and then start the engine to make sure sound is from inside engine and yes sound was from inside engine something like he said "Main Veegun, kuch esa he kaha tha". The same words were from 2 other mechanics.
After all the R&D I was planning for the following two based on engine status and ODO reading:
1-Mobil 1™ High Mileage(full synthetic for vehicles with more than 75,000 miles)
2-GTX HIGH MILEAGE MOTOR OIL(Semi-Synthetic specifically formulated for vehicles with over 75,000 miles)
1st was not available @Makki Oil change - Akbar Chowk Lahore and 2nd one was Semi-Synthetic, so I stick with Full Synthetic with Following options 10W40:
A- MICKING GOLD PRIME (Fully-Synthetic, Made in Korea)
B- ZIC X7 (Fully-Synthetic, Made in Korea)
I have MICKING GOLD PRIME 10W40 now and car picking is improving day by day.
Based on my experience and senior mechanics suggestion Never ever use STP.