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What is the NADA Retail value of your car today (used retail)? And current balance on loan?
In general if you want to refi, you'll have to bring enough cash to cover the difference between NADA Retail and current balance.
I've never heard of this 18 months, 1.49% deal, yet it keeps being mentioned around here. In general, I don't think it's wise to keep trading like that unless you hated the car or something. Yeah, sure, your interest goes to 1.49%. But you get to take the depreciation hit of YET ANOTHER new car. So you save on interest, but lose money to dealer markups/fees, trade-in dealer lowballing, and depreciation. Especially at 13%, I personally think you would be better served by trying to put extra funds every month towards the loan principal (make sure you designate extra principal payments) to try and make the loan balance and NADA retail become more balanced down the road.
What exactly is your FICO today and what bureau (fako ie creditkarma, etc... doesn't count)? "Went up a lot" is not going to help us see where you are...