I saw a few of the comments and not sure if this was discussed, But i was looking for an oil for my 10th Gen 1.6 Corolla, I looked at the manual as well and many people have mentioned 5W-30 here.
I think the reason why IMC maybe using 5W-50 and rightly so is because of their temperature rating. In Pakistan temperatures often reach as high as 45-50C and 5W-30 is only recommended till max 35C.
I was looking at this chart for reference, what do you guys think? Isn't it better to go for 5W-50. I am looking to change my car oil and my car is only 20k driven. i just noticed this is a really old thread