ghazalz, but you don't need NOC anymore to transfer ownership of a vehicle.

Go to the Madinat Khalifa police station. Walk into the little office where all the typist sit. Tell them you sold your car and you need to transfer ownership. They will take the vehicle registration for the car being sold and both persons ID cards. You will also need to get photocopies from the same place for the ID's and Vehicle registration.

Once you have the paper work, walk across the street to were you see vehicles getting plated. Grab a number and wait for your turn. When your number comes walk to the counter, hand over all the paper work and original vehicle registration. Officer will ask you to sign the form in front of him. Usually before signing buyer gives the cash to seller. And thats it, your done!!

If you have fines on the car you will need to clear those 1st from the Madinat Khalifa police station.