Friends in forum are kind of divided on this debate.
Since Maruti also doesn't mandate usage of Synthetic oil & many Swift / Dzire with same engine have completed 2lakh kms or more without trouble using mineral oil, the case of synthetic oil usage is not well justified is one argument.
However, some of our friends, who have switched feel improvements in the vehicle performance. When it was my turn (10k kms service), I also discussed it in the forum and got mixed response. In the end, I decided to go with mineral oil itself this time. May be I will try synthetic oil in 20k service.
Since Maruti also doesn't mandate usage of Synthetic oil & many Swift / Dzire with same engine have completed 2lakh kms or more without trouble using mineral oil, the case of synthetic oil usage is not well justified is one argument.
However, some of our friends, who have switched feel improvements in the vehicle performance. When it was my turn (10k kms service), I also discussed it in the forum and got mixed response. In the end, I decided to go with mineral oil itself this time. May be I will try synthetic oil in 20k service.