My suggestion is to use either of 1. Total Quartz 9000 Future Series 5w-30, 2. Shell Semi-Synthetic 5w-30, and / or lastly, 10w-30 by Caltex Havoline (I would sincerely recommend it in your particular case).
Just change oil + oil filter after regular intervals.
Ensure that oil is 100% genuine and original, and you are good to go! 