Frank Gasparre You can buy but my experience has been that you need a Non O (other long term visas may be acceptable) to be able to register a vehicle in your name. You may have seen that I have had a discussion about this with
@Brandon ***********
. All I can say is that the two DLT (Department of Land Transport) offices that I've used - Korat and Pak Chong and most sources online say that you need a Non O. The only way to find out is to check with the DLT office nearest to where you stay. As with Immigration matters, its quite possible that different offices have different requirements.