i just moved in here.
if your visa will be cancelled come august, then i think you can no longer drive it

i tried actually all the procedures.
if you're planning to export it here through either recovery (trucking) or shipping (container) the first thing you'll do is go to Traffic department, the easiest and less crowded is the one near Al Wasl, 10am is a good time to go there.

they will get your vehicle for export test and you have to pay for 25 dhs. then if you tell them you'll bring it to trucking company yourself, you'll pay around 80dhs for the export plates (blue plates) and they will get your old plates and also the registration of your vehicle (card), make sure too you cancel your salik, which has also a booth inside the building.

here are the reminders:

1.) insist you'll take the car even with the blue plates, some of the guys will tell you to leave your car with them. with the blue plates, you can drive your car for 14 more days from the day you had the local plates canceled.

2.) look for shipping company, trucking company prior to having the car be exported so that they can process all the necessary documents.

3.) usually the shipping company asked for approximately 4000 dhs. plus 500 dhs documentation. this is for shipping (your vehicle will be in a container van, 1car/container) and aroun 2500-2900 dhs for trucking, someone will drive your car, or it will be on a trucking system.

4.) if you're visa is canceled, you cannot drive it going to qatar and passing through saudi, but if your visa is not canceled, you'll get the necessary visa to enter and exit saudi arabia and qatar.

5.) if your car is less than 2 years, you will be exempted from custom duty fee (tax) in qatar. you need though to get the certificate of exemption from your car's manufacturer or agent and they will charge you 500 dhs for a page.

6) if your car is more than 2 years and less than 5 years, you will be paying 5% of the current value of your car once you get to qatar.

7) cars more than 5 years are not allowed to be exported, thus leaving you no choice but to sell it.

if you'll sell it, refer to number 1 procedure.

hope these help. :)