@mhahmed005 Well... btw... which oil grade / viscosity and brand are you currently using?
I am facing problem after switching from 5w-30 to 5w-40.
On 16-05-2018, I switched from SUSTINA 5W30 SN/RC to Havoline Pro DS Fully Synthetic LE SAE 5W-40 (since I was not able to get 5w-30 fully synthetic oil). I was like, mainay fully synthetic oil hi laina hai with API rating of SN. Agar 5w-30 na sai to 5w-40 hi sai, it is the next better to 5w-30.
Pehli baar tajurba kia aur pachtaa raha hoon.
Engine almost faut ho gya hai and is not picking power, because 5w-40 is more viscous as compared to 5w-30. Garmiyoon k lehaz sey to theek hai k viscosity behtar rahay gee 5w-30 k reference mein, but at the cost of engine performance and slightly increased fuel consumption.
Next time, when I will be changing oil, I will again revert to 5w-30 and harr kisi ko yei kahon ga k no need to switch to 5w-40 from 5w-30, unless absolutely necessary or engine is making problems.
5w-30 is the all rounder throughout the year and over all winner!
(5w-20, 5w-30 sey b behtar hai, but mostly in winters. Garmiyoon mein 5w-20 pani bann jye ga and may not provide sufficient lubrication.)