I am planning to buy a Proton Persona SE 2008 from a used car dealer. It's going for Puspakom inspection today after I made my booking. But once that is done, the dealer is asking for Full cash payment before they do the ownership transfer. It is normal? He's not listening to anything I say about the payment and is adamant on taking the full sum before name change. Is there any way I can ask to pay a bit later? Does all the used car dealerships work like that?