If an item you plan to export could possibly be an antique, go to great lengths to determine its actual antique status. Punishment for improperly exporting antiques can be severe. Punishments for defacing or littering historical sites are also severe. Don't even think of messing around with illicit drugs in Turkey. You may import 25 liters of spare fuel free of duty.
Helmets are compulsory for motorcyclists.
Credit cards are generally accepted. Unleaded gasoline is called kursunsuz benzin. Unleaded super gasoline has an octane rating of 95. Diesel also goes by the name mazot. LPG is getting more popular and is available at many stations.