@mani1, i used havoline 10-30W, ll not remove air filter, want to race with stock, am not sure which will going to win but it is obvious that both cars will definatley give tough time to each other, no doubt.
People who is saying that city will win quite EASILY OR WITHOUT ANY DOUBT, i request them to drive swift just for once, i have driven both cars in stock condition, didnt feel much difference infact swift initail pick is more aggressive as compared to city, that is why i opted to drag with City.
I am some what agree with @mubeenshahid, but the other factors like gear shifting, RPM does matter alot,, letz c