Dear @Ashhad4 and @haseeb.basharat @Xulfiqar
I was asking this whole information just to make engine performance more better.
Now plz listen dear. Using Shell Ultra from last 6000km, My car avg in city with one go is almost 12-12.5 with light paddle a.c On. On highway i use to drive at 90-100 and i got 17-18 avg with a.c and its very smooth. This is my daily routine as i have to travel to nearby city for my job.car has good pick too.
Previously i used 15-40 mobil super 1000 when i shifted from 20w50. During this, my car in city and in long was quite smooth but definitely avg was a bit low as compare to using Shell ultra (on long was 15.5 to 16.5 at 90-100kmh with ac. In city it was like 12-13.5 too without a.c) car smoothness was very good but pick was relatively low then Shell Ultra 5-40.
Now i have noticed that driving in city with Shell ultra is not as smooth as 15-40 mobil however pick and avg is good at long. relatively rough and roaring sound at 1st gear and at low speed is also there. There is no noticeable roaring voice and sound of engine at long on this shell ultra.
I want to make my engine quiter and smoother without compromising Car pick and offcourse fuel avg too. Only problem at Shell ultra is a bit roaring sound on 1st/2nd gear which also cause a bit unsmooth drive (which personally i dont like and all these experiments were done to obtain optimum performance of engine). Pick relatively better than 15-40 mobil.
Before shifting to 5-40 ultra, my plan was to pour 10-40 mobil super 2000 after draining 15-40mobil. But after consulting many car guys and Pakwheelers i decided to pour Ultra 5-40.
At this point of time, plz guide me how to get rid off this roaring sound at 1st/2nd gear throtle? Kiya esa to nahe hai k ye oil set honay me time le raha hai?? Ya phir mujhe koi Oil additive use kerna chahiye is roaring sound ko Finish/quite kerne k liye? Ya phir Mobil Super 1000 10-40 next oil drain per daal dou ya koi or Oil?
Shell ultra 5.40 fully synthetic hai jab k Mobil 10.40 semi hai. Thats why i chosed Ultra.
Please dear brain storm and advise me after reading my post in detail.