Gettin long-stay visa for work is totally impossible, There is second option for you
1. Apply for tourist visa, stay in Thailand for 2 months + extended 1 months (1900 baht fee) then lf he found job that suitable for him. convert your tourist visa to become Non-B Visa (while inside / outside country) don't forget to bring all supportive document from your employer
2. Apply for Non-ED (Education Visa) from school, 3 Months + extended, then convert to Non-B Visa when he found job
3. Elite Visa (still need to apply Non B Visa)
4. Long term visa (LTR Visa) 5 years + extended 5 years
Owner just need to give you copy passport with signature + copy visa with signature (previous owner still have valid visa, if you said your previous owner visa expired i suggest you to explain to officer at DLT) + form with signature (not sure which form but it can get from DLT, owner have it already and give earlier when they make a deal)
My friend (foreigner) just bought car from foreigner on October 2023
Document he prepared :
1. Original Blue Book
2. CoR (both from embassy / immigration is valid)
3. Form (that i mentioned above)
4. Tax paid (last year 2567)
Go to DLT Chatuchak building B / Building 2 along with all document
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