Will it be wise to spruce up my 2014 owned car, for the new 2016 and pay off the rest in payments?

Ok so I have a 2014 honda accord and I want the 2016. I own the 2014 for a year and half and it has the usual wear and tear on it. I was thinking of detailing it back to like new and sell it back to honda. Then take that money and put it towards the 2016 and pay off the rest. Is this the best way of going about it?

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