i have Chevrolet Caprice 2002 model, I was told that I can transport it from Dubai to Doha but they will charge 5% Tax of the current value of the car. if the car is 5yrs old or older then u have to pay tax. I was told any cars 2000 model or older cannot enter Qatar.
You cannot enter Qatar via land if u have only a visit visa or a business visa, only if you have your Residency visa you can enter.