he has to pay off the loan or give the other guy 8K to match the 20k even trade.
also REGARDLESS he has to pay off the loan to get the title to give to this guy OR he has to pay this other guy the fair amount to = the other guys car and transfer the loan to the other guy provided other dude is approved.
my recommendation. pay off your car, get the title, the from there the world opens up. if you wan to trade go for it, at least you will have the title in hand. also the other guy wont get screwed if you dont pay off your loan for any reason.
what he SHOULD be doing is picking up the phonecalling his loan company and get some real answers.
here in california, regardless of what you do, you pay sales tax. trade, gift, unless its a family transfer. where is southwest LA? here in los angeles we dont say.. south west LA.
anyways, laws differ in states. in california, we approve of double, tripple, quadupple taxation which i think is BS.