Used car dealer may give own waranty for atleast 6 month to make more trust on customer who is buying second hand vehicle. Some of the advertisement are strange like " Sale of one year old car but no waranty" , how it could be ? That means something happend to new car and they are trying to find a fool from local market.
We also see from social web that somebody change the km reading and selling the car. Becasue of this reason i went to buy a new car. No worry now, warranty for three year etc.