Starman, nowadays i'm still seeing cars/pickups even more than 15 years old. Still, you can get confirm info from QTI / MOI.
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Contact details of QTI
"Qatar Technical Inspection Company Co. QSC
Al Kassarat Street/ Road 24
Industrial area - Doha - Qatar
PO Box No. 22298

Tel No. +974 4604029 / 4604086 / 4606745/84 /4600576
Fax No +974 4607082

Email: [email protected]"