If a person test-drives your car and likes it, you can expect them to make an offer. if a buyer interested in your car will know where you stand when it comes to the price, they will remember the OBO, Must Sell, Asking Price, or Firm that you added to your ad.

Use you intuition and try to ensure that you both are on the same page. If you have left yourself some room to negotiate, don't jump to your lowest price quite yet, if you offer to take even Rs 100 off the price, this may just be what the buyer wants to hear.

Then again they may want to pay much, much less, in this instance, refer to the mechanics report all other options to ensure your best price. Remember that the buyer may be bluffing, so be as honest as possible. Still if they are not sold give them you final price, and leave it upto them. When the car is first put on the market stay as firm as you can on the price, if the car does not sell in the amount of time you want it to, lower the price a bit, but keep in mind that you have a price that you cannot budge from.