Bro, agar engine ki pick, power, performance mein faraq na aye and na hi oil reduce ho, then no need to go for 10w-40 or higher grades. Aesi examples b exist karti hain k log 3.5 lac + kms takk 5w-30, API SN, Fully Synthetic Oils use kartay rahay hain and engine ko ratti brabar farq nai para. Reason, they just used to change oil and filters timely.
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But sometimes, manuals mein b gar barr hui hoti hai, I have just given 01 example in one of my posts above.
Sometimes, I do not understand that when Fully Synthetic / Synthetic oils are easily available and from well-reputed brands, then why they go for semi-synthetic? Inhein engine k ha'al p reham nai aata?
Bro, aap jiss market mein b chalay jyein, aapko at least 02-03 shops lazimann mill jyein gee, jinki harr banda tareef karay ga k yahan sey genuine cheezain milti hain. Wo b, jiska uss shop sey kuj laina daina nai hota, and, ussi ki baat mein subsay zyada dumm hota hai, since opinion will be truly honest.
Genuine engine oils can either be directly bought from retailers / dealers as per details mentioned on official websites or from company operated petrol pumps (as in case of Shell, Total, etc.) Mega stores like Metro also have 100% genuine and original oils.
Ye hum Toyota, Honda, ya Suzuki wagaira sey b puchnay ki himmat / jurraatt nai kar saktay! Agar kisi ney himmat kar k pucha ho aur unho ney dikhaa b di hoon, kindly experience zrur share karay.
And also do remember, most of the websites of engine oils operating in Pakistan are not official, authorized and authentic websites! Ye dealers ney khudd hi sey bnaa rakhi hain. Agar ye official hoon then aapko main websites sey unka link zrur milay. So, one should be very careful while making a decision.