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Where to advertise
First, you may simply put a ‘For Sale’ sign on your car.
If you are sure your car is in good condition, consider putting the word out to your colleagues that you are selling your car. Someone might be in the market for a car. Here are some additional links to good sites to place an ad:

How to close the deal keeping the price high
Prepare your car for sale. Make sure that it is spotless inside and out. Have all the maintenance records, emission test results (if they are good, of course) and receipts for any new parts such as tires, brakes or a battery handy to show to potential buyer.
When a buyer comes to look at the car, give lots of time for the buyer to inspect the car and don’t interrupt or rush them.
If the buyer seem to like it (usually it’s quite easy to see), but still seems to be concerned about the price, point out all the options that your car has, such as heated mirrors, folding seats and any other bells and whistles – everything that may add value to your vehicle. Show the buyer the maintenance records to prove that you have taken good care of the car. If you have receipts for new parts like tires or brakes, show them as well. If you have an extra set of tires that you want to give with the car, mention it too.
If the potential buyer is interested, but is still hesitating, pull out the Used car history report, and advise the buyer that you got the report to save them time. Potential buyers will have more confidence that your car is a good purchase.
Finally, mention that you have other people coming to look at your car.