For the sake of showing appreciation the work of the domestic automotive, usually heads of state to use a local car as their official car.
President of the United States for example, use a Cadillac limousine, the Emperor of Japan using a Toyota, the king of England using a Bentley, and the prime minister of Italy using a Maserati.
For those countries that have more than one car company, usually they use interchangeably.
Besides the honor, the use of cars in the country as the official state car is also to show the greatness of their cars. At the very least, the car to head of state has special security features, such as the use of steel and bulletproof glass.
Unfortunately, not all countries have a competent automotive company. Therefore, they usually choose a car production countries that have diplomatic ties strong.
Canada's example, exclusively use the cars manufactured by General Motors. Prime ministers use the Chevrolet Tahoe and Chevrolet Express.
In the ASEAN region, countries that have used local car just Malaysia. Prime Minister of Malaysia using the Proton Chancellor.Nevertheless, Malaysia is also still use the BMW 740Li.
Meanwhile, the prime minister of Thailand to ride Mercedes-Benz S600L W220, BMW 730LI E66, and Range Rover. And president of Mercedes Benz S350L Singapore uses and Lexus LS430.
The most eccentric instead of Brunei Darussalam. Affairs piece on Borneo island is using the official car Rolls-Royce Phantom VI.This is for official events, when relaxed, his state car turned into a sports car Mercedes Benz W163 ML55 AMG and Maybach 62.
What about Indonesia? President Susilo Bambang Yudhoyono to use Mercedes-Benz S600L W221 made in 2007.