I think that you are a pakwheeler, even than u said something with "w" is irrelevant in Pakistan, you should must go for mental treatment if you think something of this kind, because xW is 2 things,
1 is winter, plus 2nd is starting of engine after a long delay like whole night when it's at normal or you may say it's cold, hi xW means thick oil, which is not suitable for many new cars now a days, like 0w, 5w, or 10w