How do I buy a second-hand car and manage the tax and insurance in Thailand?

When buying a second-hand car in Phuket, it is crucial to check if the car has a 'blue book' and to ensure proper paperwork is completed at the Department of Land Transport (DLT). Compulsory insurance is required to obtain car tax, which includes basic 3rd party coverage. If the car is over five years old, a test certificate is also necessary. For better coverage, first-class insurance can be purchased alongside the compulsory insurance. It's recommended to involve a reliable local, especially when purchasing from a private seller.