Atta Sir, we are always being advised by our mechanics, toyotoa 3S to use 5W30 for 1KRFE although i beginning we asked them to use 0W20 but every one including Manual says that both grades are most preferred , so if an authorized technician who deals with dozens of vehicles daily , we have no option except trust him beside manual as well.
And now you are saying that 5W30 destroys 1KRFE. that is a very serious claim, you need to prove it so we can sue or take to court hundreds of those technicians/company manual who says that 5W30 is best for 1KRFE for Vitz/Passo.
Same way you already said about LM 5W30 that its old technology and (although we pay for these Brands much higher than Toyota Genuine Oil). leaves question marks
Engine Oil selection is not like "Aap ki Marzi", its a serious allegation that should be discussed, I will wait for some experts opinion by @xulfiqar and some other professionals.
Note. I have Vitz 2014 model 1KRFE current 46K Odo reading